see Acts 22:16 to see what “calling on the name of the Lord” means.
for 1,500 years after Jesus left this earth, the Church taught baptismal regeneration because this was the faith it received from the Apostles. beginning in the 16th century, false teachers arose and taught a new gospel.
12 And one Ananias, a devout man according to the law, having a good report of all the Jews which dwelt there, 13 Came unto me, and stood, and said unto me, Brother Saul, receive thy sight. And the same hour I looked up upon him. 14 And he said, The God of our fathers hath chosen thee, that thou shouldest know his will, and see that Just One, and shouldest hear the voice of his mouth. 15 For thou shalt be his witness unto all men of what thou hast seen and heard. 16 And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord.
As any devout man would suggest...