Christians can go back to the world and become corrupt as in not being in right standing with the Lord anymore.
If they don't forsake their sin and confess it to the Lord to be cleansed they will sadly go to hell.
Don't confuse "nominal" Christians (1 John 2:19) with genuine Christians (God's saints) who are
preserved forever (Psalm 37:28) and
eternally secure in the hands of Jesus Christ (John 10:27-28) and
sealed with the Holy Spirit of promise, who is the guarantee of our inheritance until the redemption of the purchased possession. (Ephesians 1:13-14)
Galatians 6:7-8 (see Gen 8:22)
Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap.
For he that soweth to his flesh shall of the flesh reap corruption; but he that soweth to the Spirit shall of the Spirit reap life everlasting.
In regard to
Galatians 6:7-8, the one who is continuously (Greek present tense) sows to his own corrupt, flesh which is opposed to God and unrenewed by the Holy Spirit shall of the flesh reap corruption. Our life here is sowing of one kind or another. But he who sows to the Spirit shall of the Spirit reap everlasting life.
Only believers sow to the Spirit and from the Spirit will reap eternal life. Romans 8:8 - So then,
those who are in the flesh cannot please God. 9
But you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. Now if anyone does not have the Spirit of Christ, he is not His. 10 And if Christ is in you, the body is dead because of sin, but the Spirit is life because of righteousness.
God gave man free will... if man chooses to turn and walk away from the Lord, God will let them do so.
Make believers who are not His sheep walk away. (John 6:64-66; 10:25-26; Hebrews 3:12-19; 10:39; Jude 1:5)
Romans 1:28
they did not like to retain God in their knowledge, God gave them over to a reprobate mind, to do what ought not to be done
Context. Romans 1:18 - For the wrath of God is revealed from heaven against all
ungodliness and unrighteousness of men, who suppress the truth in unrighteousness... 21 because, although they knew God,
they did not glorify Him as God, nor were thankful, but became
futile in their thoughts, and their foolish hearts were darkened. 22 Professing to be wise, they became fools, 23 and
changed the glory of the incorruptible God into an image made like corruptible man—and birds and four-footed animals and creeping things. Through general revelation in creation, man can see God's eternal power and divine nature in the world, but can suppress this knowledge, failing to glorify Him or give thanks, which results in
foolish, darkened hearts. 24 Therefore
God also gave them up to uncleanness, in the lusts of their hearts, to dishonor their bodies among themselves, 25 who
exchanged the truth of God for the lie and
worshiped and served the creature rather than the Creator, who is blessed forever. Amen. 28 And even as they
did not like to retain God in their knowledge, God gave them over to a debased mind, to do those things which are not fitting; 29 being filled with
all unrighteousness.. THESE WERE NOT CHRISTIANS. 1 Corinthians 6:9 - Do you not know that the
unrighteous will not inherit the kingdom of God?
2 Peter 2:20
For if after they have escaped the pollution of the world through the knowledge of the Lord and Savior Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning.
In regard to
2 Peter 2:20, those who are truly born of God are
partakers of the divine nature. They have been transformed from pigs and dogs into sheep. The change is more than just cosmetic, as in
2 Peter 2:20.
*These cleaned up on the outside dogs and pigs were
never sheep.
Compare
2 Peter 1:4 -
"partakers of the divine nature, having escaped the corruption - Strongs #5356 that is in the world through lust with
2 Peter 2:20 - with they
escaped the pollutions - Strongs #3356 (different Greek word) of the world through the knowledge of the Lord and Savior Jesus Christ, yet they are again entangled therein, and overcome.
*Notice that
2 Peter 2:20 did not mention them being "partakers of the divine nature." Corruption is deeper than pollutions/defilements on the outside: it is
decay on the inside.
Having the knowledge of Jesus Christ does not save a person if there is
no heart submission to that knowledge. The latter end is worse than the beginning for these men because rejecting this knowledge will make them more accountable at the judgment. Judas Iscariot is a good example of someone who rejected the knowledge of the Lord and Savior Jesus Christ yet was
never saved. (
John 6:64-71;
13:10-11)
2 Timothy 2:12
If we deny Him, He also will deny us
In regard to
2 Timothy 2:12, I see a contrast with, "if we died with Him, we shall also live with Him. If we endure, we shall also reign with Him -- AND -- If we deny Him, He also will deny us. If we are faithless, He remains faithful; He cannot deny Himself.
"By contrast, the latter "deny Him and faithless" points to the opposite of died with Him, endure and reign with Him. Jesus Himself warned of the danger of denying Him in
Matthew 10:33 - "But whoever shall deny Me before men, I will also deny him before My Father who is in heaven.." To "deny him" here does not point merely to a temporary weakness of faith, as in the case of Peter who denied Jesus three times during a moment of weakness (
Luke 22:54-62) but is referring to life in its entirety. The inevitable result is that "He will also deny us."
The warning is repeated in the final sentence, "if we are faithless, he remains faithful." To be "faithless" is in the present tense and denotes this as the habitual attitude, not a temporary lapse of faith. But in contrast to human faithlessness, "He remains faithful," faithful to His word and righteous character and His warning that unbelievers will be rejected.