Is the only sin to be repented of is the sin of murdering Jesus?
For your information: The only Way that has been perfected to get into heaven is by the faith to repent of the one sin of Jesus' murder for the forgiveness of ALL sins. This is the only way to obey the Acts 2:38 command.
I left the grammar of this note basically as given since I can't be absolutely sure I understood the intended statement. I assume that you are claiming that the only sin people need to repent of is the sin of murdering Jesus. If this is the case, you need to read Acts 2:38 again. "Then Peter said to them, "Repent, and let every one of you be baptized in the name of Jesus Christ for the remission of sins; and you shall receive the gift of the Holy Spirit." Notice that "sins" is plural. The audience Peter was addressing was guilty of murdering the Christ, but this wasn't their only sin. Repentance and baptism for the remission of sins, not just one sin. Paul demonstrates this when he was told, "And now why are you waiting? Arise and be baptized, and wash away your sins, calling on the name of the Lord" (Acts 22:16). Paul tells us about many of his sins in I Timothy 1:12-13, crucifying Jesus was not one of these sins.
There are many sins which will keep people out of heaven. "Do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived. Neither fornicators, nor idolaters, nor adulterers, nor homosexuals, nor sodomites, nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will inherit the kingdom of God. And such were some of you. But you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus and by the Spirit of our God" (I Corinthians 6:9-11). However, the remedy for sins remains the same: "but you were washed ..."