I need help in clarifying justification as Protestants account for it.
I'm a sinner, and I'd like to one day enter heaven. But heaven cannot contain sin, therefore if I am to enter heaven, I am to be without sin.
How then will imputed righteousness be sufficient in allowing me to enter heaven? It seems I would need to be actually internally changed, or infused with Christ's righteousness if I'm even to last one moment in Heaven.
Please stay on topic. I know questioning forensic justification leads to Catholicism, but I'd really like to just understand who Christians are able to enter heaven with imputed righteousness alone. All popery and anti-Catholic replies should be ignored and avoided.
Since it is you who postulated Catholic theology, in which the system of salvation begins with one being made formally justified by his own ("infused") righteousness, and thus made good enough to be with God, and thus usually ends with once again being made good enough to enter Heaven, then it is fitting that Catholicism is mentioned.
As for how Christians are able to enter heaven with imputed righteousness alone, they do not, since now one can have imputed righteousness except by salvific faith, which is penitent and results in the heart being purified in the washing of regeneration, and which effects obedience by the Spirit.
Thus the redeemed are not simply "white-washed sinners" as "Catholic Answers" type propagandists describe it, but the key aspect here is that the works of effectual faith is not the basis for one''s acceptance by God. If it were then you could not presently be accepted in the Beloved and seated with Him in Heaven,(Ephesians 1:6; 2:6) and would lose that if anything defiling was found in you, which your flesh is, and if your character has sinful defects.
However, holiness is a necessary fruit of faith, which means in Scripture in the overall sense, with repentance when convicted of not being faithful, but not that believers never sin, much less are as good as Christ in character.
In short, it is because faith is counted for righteousness that you presently have access with boldness into the holy of holies, (Hebrews 10:19) and if you died in that faith or if the Lord returned then you would go to forever be with the Lord, as 1 Thessalonians 4:17 promises, because of Him "that loved us, and washed us from our sins in his own blood, (Revelation 1:5) Thanks be to God.
Below is an extended explanation i hope will help.
As far as what appropriates justification, one is only saved by grace thru faith, which purifies the heart (Acts 15:9) and is counted for righteousness (Romans 4:5) and renders one accepted in the Beloved (on His account) and positionally seated together which their Lord in Heaven, (Ephesians 1:6; 2:6) from where they await the Lord's return and His changing of our "vile body," that it may be fashioned like unto his glorious body." (Philippians 3:21)
However, this saving justifying faith, is a faith which effects obedience by the Spirit in word and in deed, in heart and in life, whereby "the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit, (Romans 8:4) insofar as we do. And which obedience includes Godly sorrow, penitent confession of sin that the believer is convicted of.
The appeal to the believer is to produce fruit consistent with faith, as a consequence of being accepted in the Beloved (on His account), to be practically (in heart and deed) as they are positionally in Christ, to be as much conformed to the Lord Jesus in this life as we can be, and will be in the resurrection. (Philippians 3:7-21)
If we live in the Spirit, let us also walk in the Spirit. (Galatians 5:25)
If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God. Set your affection on things above, not on things on the earth. For ye are dead, and your life is hid with Christ in God. When Christ, who is our life, shall appear, then shall ye also appear with him in glory. (Colossians 3:1-4)
But which progressive practical sanctification is not the cause of the sinner's justification and acceptance in Christ, but testifies to such being a believer, evidencing "things which accompany salvation," (Hebrews 6:9) and fit to be rewarded. (Revelation 3:4) For this faith, as manifested in said obedience, God will recompense (Hebrews 10:35) under grace, even though it is God who motivates and enables all obedience, (Philippians 1:12,13) while the only thing we can and must take credit for it our disobedience.
In
contrast to this salvation by effectual faith, evidencing meritorious works but which are not the cause of justification (though they justify one as being a believer, since they go together like light and heat), is salvation by grace thru works, as in Roman Catholicism, in which by grace one is actually made good enough to be with God via the act of baptism, even without the required personal wholehearted repentant faith. (Acts 8:38; 8:36,37)
However, since the carnal nature remains and few successfully attain to complete victory over any attachment to sin and perfection of character, then most baptized souls are sent to Roman Catholic (EOs trend to reject Rome's) Purgatory to endure purifying torments to atone for sins they sufficiently failed to provide for while on earth, and become good enough to enter glory.
There is some wiggle room as regards the conditions of purgatory since they are not dogmatic, but while salvation by grace thru faith as in sola fide means it is effectual faith being imputed for righteousness that justifies, salvation by grace thru works means that by grace one is actually made good enough to be with God, which premise either requires perfection of character in this life (and which merely being made clean in baptism would actually not effect) or postmortem purifying torments.
However, wherever Scripture clearly speak of the next conscious reality for believers then it is with the Lord, (Lk. 23:43 [cf. 2Cor. 12:4; Rv. 2:7]; Phil 1:23; 2Cor. 5:8 [“we”]; 1Cor. 15:51ff'; 1Thess. 4:17) Note in the latter case all believers were assured that if the Lord returned, which they expected in their lifetime, so would they “ever be with the Lord,” though they were still undergoing growth in grace, as was Paul. (Phil. 3:10f)
And the next transformative experience that is manifestly taught is that of being like Christ in the resurrection. (1Jn. 3:2; Rm. 8:23; 1Co 15:53,54; 2Co. 2-4) At which time is the judgment seat of Christ, which is the only suffering mentioned after this life for the believer, which does not begin at death, but awaits the Lord's return, (1 Corinthians 4:5; 2 Timothy 4:1,8; Revelation 11:18; Matthew 25:31-46; 1 Peter 1:7; 5:4) and is the suffering of the loss of rewards (and the Lord's grievous displeasure) due to the manner of material one built the church with, which one is saved despite the loss of such, not because of. (1 Corinthians 3:8ff)