1/ This Passage in Ephesians 5 gives an analogy of the Church as the Bride of Christ, especially the verse that ultimately Jesus would present the Church to Himself as a Glorious Church without any blemish. This scripture passage continues to be taken by many Christians, including evangelical Christians, as an indication that it is teaching mostly about experiential holiness or sanctification by increasingly dedicated Christian living by born again Christians. It is used to teach that Jesus won't come for the Church to take us to be with Himself and to heaven until the Church is much more holy and dedicated to Him and living according to His word - the Holy Bible and living by His Holy Spirit.
2/ I don't deny, but certainly agree, that it is God's will for the true Church as a whole and for all individual true Christians to have holy living to God and to minimize sin in our lives. However, I don't think that is the main sense that the passage in Ephesians 5 mentions a glorious Church without spot or wrinkle. I believe one scripture passage that is in context with the glorious Church mentioned in Ephesians 5 is also in Ephesians but in chapter 3. In Ephesians 3 the Church is described as perfect and clean in God's sight due to all its members having personally admitted or confessed our sins to God through Jesus. Confessing our sins to God through Jesus includes asking God's forgiveness and trusting in Jesus especially His death on the cross for our sins and His resurrection from the dead to be justified with God. This is what God requires and is satisfied with for positional salvation, sanctification, holiness or cleansing and this is what I believe the glorious Church without spot or wrinkle in Ephesians 5 is really talking about. Ephesians 3 also talks about a Church from among all the Gentiles (ethnos) or nations and I believe that is what Jesus and God the Father is waiting for the most to come for as a glorious, complete and spotless true Church.
3/ Another scripture passage in the New Testament that I believe is in context with the glorious Church without spot or wrinkle that Jesus will present to Himself is in Colossians 1. In that chapter of God's word, among other things, the Apostle Paul mentions in verse 22 that it is due to Jesus shedding His blood and dying for us on the cross that He can present us to Himself holy, unblameable and unreproveable in His sight. To say that the Church would be holy, unblameable etc. in God's sight is about the same as saying that He will present the Church as a glorious Church without spot or wrinkle or any such thing. There are two very important things to note here. One is that it is Jesus that is presenting the Church in a perfect state to Himself rather than the believer presenting ourselves individually and collectively as all the true Church presenting ourselves perfect to our Lord and Saviour Jesus Christ. It is however, the latter idea that is more popular in substantial parts of the Church including much of the evangelical Church. The second point is that the basis for those who become Christians to be presented holy or without spot to Jesus and to God the Father is in our coming to believe in His substitutionary death on the cross and resurrection from the dead for our sakes. This positional salvation in Jesus is the basis for our being able to be presented to Jesus as holy and unblameable or without spot and wrinkle and that we have achieved positional salvation, justification, reconciliation or cleansing through Jesus' shed blood. This positional salvation in Jesus is the basis for the Church to be without spot or unblameable in God's sight rather than this perfect level of holiness and unblameable state in God's sight as having been accomplished by our own good works after we are saved or by experiential salvation or sanctification from the power of sin. However, of course I do believe and seek God's power myself to live for Him and to cleanse me of my sins through prayer in Jesus' name on an ongoing basis.
Another point in Colossians 1 that I believe relates to the analogy of the bride of Christ being presented to Jesus as a glorious Church without spot or wrinkle in Ephesians 5 is that in Colossians 1:28 the Apostle Paul mentions that we, meaning he and other apostles or other evangelists or Christian disciples, are seeking to present every man perfect in Christ Jesus. But what does he mean by that? I believe the context is in the preceding verses of this chapter including that we have achieved Christ in us. The New Testament teaches this happens when we trust in Jesus as our personal Lord and Saviour that we are sinners and need His death on the cross and resurrection to be justified and sanctified in God's sight. In verse 20 and 21 in this chapter of Colossians 1 it does give the basis of Jesus shedding His blood and dying on the cross to pay for our sins and His resurrection for us to be justified and sanctified in God's sight. In verses 20 and 21 in this chapter in Colossians 1 it does give the basis of Jesus shedding His blood and dying on the cross to pay for our sins and His resurrection from the dead on the 3rd day to enable us to be reconciled to God. After being reconciled to God then Jesus comes to spiritually dwell in our hearts when we personally believe in Him in this way or in the way of the gospel of our Lord Jesus Christ. However, this passage does also mention that if we are really saved, reconciled, or come to have positional holiness through faith in Jesus it should be evident in our lives. This evidence of salvation or, reconciliation to God in our lives should include our continuing or enduring in our Christian faith sometimes despite persecution or marginalization in society for Jesus' sake. This shows our faith and thanksgiving to God through Jesus for His gracious salvation. It also shows we look forward to the fuller realization of our hope in Jesus when He comes again to take us to heaven when He comes from heaven for His Church. It also shows that we agree with the partly fulfilled Christian hope that most of the true Church or true Christians who have already in this Church Age been born, believed in Jeuss and have died have already partly realized their Christian hope with their spirits having gone to heaven, rather than hell, when they physically died and their spirit and soul left their bodies on Earth.
Colossians 1 emphasizes that it is the individual Christian who is being presented by Jesus to Himself in verse 22. This individual basis of being presented to Christ is also mentioned as assured in Colossians 1 verse 28 and by Paul and other evangelists through sharing the gospel to those who come to believe in Jesus. Both these scripture references in Colossians 1 of being presented to Christ for Christians are instead of collectively for the whole Church of Jesus presenting it to Himself in Ephesians 5. However, this presenting to Jesus in Colossians 1 is stil talking about the same thing in Ephesians 5 as the whole Church is just the collection of all true individual Christians. Also all true Christians are members of the true Church Age part of the Kingdom of God. Lastly, in Colossians 1 it is also mentioned that what Jesus or the apostles or other disciples present to Jesus is the collection of all true Christians, that is all the true Church, that is from all the Gentiles or from all nations. I still believe all nations are the 70 Genesis 10 Noah nations rather than the about 15,000 so-called people group nations or than the political nations of the day that is currently just over 190 in number.
4/ I believe this present Church Age or Age of Grace or Dispensation of Grace that started at Pentecost almost 2,000 years ago around 32 or 33 AD in Jerusalem will end with the rapture or catching up to heaven of all true Christians or members of the true Church. At the rapture all true Christians of this present Church Age will be instantly transformed into our changed or resurrected spiritual bodies and with only our new sinless hearts or natures in Christ. We will from then on no longer have our old sinful including selfish Adamic nature. I believe the promise that all members of the true Church or all true Christians taking part in the rapture will be based on positional salvation or sanctification as in Ephesians 3, Colossians 1 etc. and in 1 Thessalonians 4:14. In these scripture passages the condition for people taking part in the rapture or translation to heaven at the end of the Church Age, just before the tribulation and following Second Coming from heaven to Earth of Jesus to set up His Kingdom on Earth, is to trust in our hearts in Jesus. Again to trust in Jesus is to trust that He died on the cross for us and our sins and rose again bodily from the dead. I believe 1 Thessalonians 4:14 is also more consistent with the basis that people need to trust in Jesus and be saved by faith alone in Him and in His death and resurrection for positional salvation, cleansing of sins and sanctification. Again I believe the key bais of the promise of participating in the Christian hope is positional salvation through faith in Jesus rather than an emphasis on relying on experiential salvation after trusting in Jesus for positional salvation.
I also believe the basis of Jesus presenting the true Church to Himself without spot or wrinkle as His spiritual bride in Ephesians 5 will also officially happen at the rapture of the Church at the end of this present Church Age very soon. However, again there is in the context of the rapture in 1 Thessalonians 4:13-18 earlier in the chapter an urging to holy living or experiential holiness and clean living by Christians or members of the true Church. This holy living is seen as evidence that we have trusted in Jesus and obtained the new nature in Christ. Another way of viewing living in the Christian new nature is trhat we become born of the Holy Spirit that is indwelt by and can be filled, directed and empowered by God's Holy Spirit to live for God rather than self, sin, the devil or other demons or the world system. However, I believe the essential criteria for taking part in the rapture or being presented as part of His glorious Church to Himself by Jesus in 1 Thessalonians 4 is also our personal trusting in Him in our heart in His death on the cross and resurrection for our new life. When we come to be in this new life in Christ by His grace and faith in Jesus we become one of His spiritually and eternally restored children to restore what we lost in what we by physical conception and birth by default inherit that is our sinful including selfish human nature through our first parents Adam and Eve.
5/ Some passages, including some already mentioned, that do mention that Christians who have obtained positional salvation in the Lord Jesus Christ and who are then destined to go to heaven, should manifest that new nature in practicing holy and godly living are Colossians 1, 1 Thessalonians 4, 2 Corinthians 1 and 2 Peter 1 and others.
6/ Some people, including some Christians, might use some passages such as Revelation 19 or elsewhere in Revelation that says the Bride of Christ or believers in general have clean and white raiment that is the righeousness of saints in Revelation 10:8 or that the true Chruch the bride of Christ in Revelation 19:7 had made herself ready to support their view that true Christians or the entire true Church needs to have significant experiential holiness for the Church to be ready for Jesus and for Him to present the Church to Himself as a glorious Church in heaven. Another scripture in Revelation 21:2 of the New Jerusalem and those dwelling in it including all the true Church as being prepared as a bride adorned for her husband might also be used by some Christians to support that the Church the bride of Christ is pleasing or glorious or prepared in God's sight by experiential godly or holy living. I believe rather that the true Church's or the Church Age phase of the Kingdom of God's or the bride of Christ members qualify as these things in God's sight simply on the basis of having come to personally confess our sins in Jesus' name to God and to trust in Jesus as our personal Lord and Saviour to get God's positional and guaranteed ultimate salvation from the presence of sin in the life to come. It is possible however that holy living could be some of the secondary part of the adorning of the bride of Christ but that is also when we as Christians allow Jesus to live through us and in us in our new nature in Him. Another way of saying true Christians live for God experientially is that we follow the leading, filling or empowering of His Holy Spirit intead of living in our old Adamic or fallen fleshly nature for self and sin, the devil or the world system on Earth and in this present age.