Baptism seals the Christian with the indelible spiritual mark (character) of his belonging to Christ. ... Given once for all, Baptism cannot be repeated. The baptisms of those to be received into the Catholic Church from other Christian communities are held to be valid if administered using the Trinitarian formula.

What does the Bible say about getting re baptized?

The Biblical basis for this is Acts 19:1-7, which tells how Paul rebaptized those who had previously been baptized by John the Baptist and now came to understand the gospel more fully. ... In such cases, re-baptism is a public confession that the person has repented of their sins and returned to their allegiance to Christ.

Does God forgive sin after baptism?

Not every deadly sin willingly committed after Baptism is sin against the Holy Ghost, and unpardonable. And therefore they are to be condemned, which say, they can no more sin as long as they live here, or deny the place of forgiveness to such as truly repent. ...