What effect does a person's re-baptism in the Baptist church have?
If a person is baptized in the Catholic Church as an infant and then elects to be baptized in the Baptist church as an adult, what effect does this have?
The new baptism, in itself, has no effect. "Baptism seals the Christian with the indelible spiritual mark (character) of his belonging to Christ. . . . Given once for all, baptism cannot be repeated" (CCC 1272).