Can sin unsave you?
Works do not save us, works do not keep us saved, and works definitely do not prove we are saved. GRACE is a gift of unmerited favor - workless favor. You can't work for it. The problem is people mix salvation - being saved the instant one believes and puts their trust in the one new gospel Jesus gave to Paul for us today, from living a proper Christian life.
As believers we should not live in sin, ever. Will we stop sinning? Not while we are still breathing. You see, God's grace is not a license to sin. God's grace, once we are saved, gives us the opportunity to stop sinning. But we still sin. That is why Christ had to die for our sins, every one of them, past present and future. We are eternally secure in Christ once we are saved. Just like the Corinthians who were in sin yet Paul still after their sin calls them washed, sanctified and brethren. Still saved yet still sadly sinning. Does our sin cause us to lose our salvation? No, works don't save us and the works of sin do not lose our salvation either.
Once we are saved, a future sin, whether deliberate, habitual or accidental (if there is such a thing) will not take away the eternal life Christ promises to give us by His grace once we are saved. You either have eternal life the minute you are saved or you don’t.
(Rom 6:23) For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord.
If sin can unsave you then there would be no such thing as living "carnal".
1Cor 3:1 KJV And I, brethren, could not speak unto you as unto spiritual, but as unto carnal, even as unto babes in Christ.
1Cor 3:2 KJV I have fed you with milk, and not with meat: for hitherto ye were not able to bear it, neither yet now are ye able.
1Cor 3:3 KJV For ye are yet carnal: for whereas there is among you envying, and strife, and divisions, are ye not carnal, and walk as men?
See, Paul calls them "brethren". Still saved but still in the sins mentioned in verse 3.
If sin can unsave you then there would be no sense to lose rewards.
1Cor 3:13 KJV Every man's work shall be made manifest: for the day shall declare it, because it shall be revealed by fire; and the fire shall try every man's work of what sort it is.
1Cor 3:14 KJV If any man's work abide which he hath built thereupon, he shall receive a reward.
1Cor 3:15 KJV If any man's work shall be burned, he shall suffer loss: but he himself shall be saved; yet so as by fire.
Notice verse 15. Works are burned (not people) yet still saved.
Thank God for this verse:
(Col 2:13) And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened together with him, having forgiven you all trespasses;
The bible is very clear. We need to rightly divide the word to understand the meaning of the verses we read. Most believers do not rightly divide the word thus they take verses that do not apply to the body of Christ and try to make them for us today. Take the book of James for example. James tells us who he is writing to in the 1st verse of the book. "to the 12 tribes". Today when a person gets saved he enters into the body of Christ by grace through faith. We are not in a tribe of Israel. We are part of His body. We are saved by GRACE not works. Be careful not to read verses meant for Israel (Matt, Mark Luke John, Heb – Rev.) and apply them to us. Those books are written to and about Israel. They were under the law and the kingdom gospel. Today we are not under the law and our gospel is the gospel of Christ, not the good news (gospel) of that of an earthly kingdom coming for Israel. ALL scripture is FOR us but not ALL scripture is written to and about US.
(Eph 2:8) For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:
(Eph 2:9) Not of works, lest any man should boast.