Baptism is a one-time event. Baptism cleanses original (Adam's) sin from a person's soul. Romans 5:12 , Romans 5:16, Romans 5:19 This cleansing of original sin from the person's soul now makes it possible for the person to have
hope that he will inherit eternal life.
Titus 3:7 Before Jesus died on the cross and rose from the dead, no human could enter into the third heaven to be with God the Father.
John 3:13
Baptism also removes the person's personal sins that are on his soul at the time of his baptism. Acts 22:16
After baptism, when a person sins a mortal sin, he loses his salvation because the Holy Spirit does not remain/abide in a person who has sinned a mortal sin. Acts 5:32, Hebrews 10:29-31,
John 15:5-10
1 John 5:16-17
If any one sees his brother committing what is not a mortal sin, he will ask, and God will give him life for those whose sin is not mortal.
There is sin which is mortal; I do not say that one is to pray for that. 17 All wrongdoing is sin, but there is sin which is not mortal. rsv
Examples of mortal sins which cause the loss of salvation:
Revelation 21:8
But as for the cowardly, the faithless, the polluted, as for murderers, fornicators, sorcerers, idolaters, and all liars, their lot shall be in the lake that burns with fire and sulphur, which is the second death. rsv
Ephesians 5:5-7
Be sure of this, that no fornicator or impure man, or one who is covetous (that is, an idolater), has any inheritance in the kingdom of Christ and of God. 6 Let no one deceive you with empty words, for it is because of these things that the wrath of God comes upon the sons of disobedience. 7 Therefore do not associate with them, rsv
1 Corinthians 6:8-10
But you yourselves wrong and defraud, and that even your own brethren.
9 Do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived; neither the immoral, nor idolaters, nor adulterers, nor sexual perverts, 10 nor thieves, nor the greedy, nor drunkards, nor revilers, nor robbers will inherit the kingdom of God. rsv
Galatians 5:19-21
Now the works of the flesh are plain: fornication, impurity, licentiousness, 20 idolatry, sorcery, enmity, strife, jealousy, anger, selfishness, dissension, party spirit, 21 envy, drunkenness, carousing, and the like. I warn you, as I warned you before, that those who do such things shall not inherit the kingdom of God. rsv
Colossians 3:5
Put to death therefore what is earthly in you: fornication, impurity, passion, evil desire, and covetousness, which is idolatry. rsv
Matthew 6:15
but if you do not forgive men their trespasses, neither will your Father forgive your trespasses. rsv
1 Timothy 5:8
If any one does not provide for his relatives, and especially for his own family, he has disowned the faith and is worse than an unbeliever. rsv
So what must a person do to regain his salvation after he has committed a mortal sin and lost his salvation?
1 John 1:9
If we confess our sins, he is faithful and just, and will forgive our sins and cleanse us from all unrighteousness. rsv John 20:19-23
Acts 26:19-20
Wherefore, O King Agrippa, I was not disobedient to the heavenly vision, 20 but declared first to those at Damascus, then at Jerusalem and throughout all the country of Judea, and also to the Gentiles, that
they should repent and turn to God and perform deeds worthy of their repentance. rsv
Ezekiel 33:12-15 shows us that when a righteous man commits a mortal sin, he is no longer righteous. He becomes wicked because of his sin. "
Yet if he turns from his sin and does what is lawful and right, 15 if the wicked restores the pledge, gives back what he has taken by robbery, and walks in the statutes of life, committing no iniquity; he shall surely live (he shall enter into eternal life after his physical death)
, he shall not die (he shall not enter into the second death after his physical death)."
Revelation 21:8