Credo Baptism or believer's baptism is a very old pagan practice. Harold Bloom has well noted that this baptist view is a distinctly American form of Gnosticism with no connections to history. Believers are so simple-minded that they believe that BAPTISM NOW SAVES. Or that repentance AND be baptized was FOR or in order to the remission of sins and EIS never, ever means BECAUSE of remission of sins.
Apollo is called the Washer and the creation of anxiety through music caused people to believe that the gods were transforming them through external means: that goes back to Nimrod who led around a female music team for that purpose.
After you had been washed by some kind of ecstatic fit, you should then be baptized to PROVE to everyone that you had been purified without the mundane water.
This is the root of the "two gospels" where Jesus did not die for the Credo Baptismists but Christ must come after they have been certified by the collective and die SPECIFICIALLY for you. That is the same messages as the other "sacrament" the eucharist or mass. In some cases it was believed that the person must BECOME Christ and die for his own sins.
I haven't been able to find SOVEREIGN in the Bible.