Water baptism...
John the Baptist was an OT believer, not Church.
Peter wanted to carry over into the Church age the dietary mandates found in the Law, but the Lord told him to stop.
About noon the following day as they were on their journey and approaching the city,
Peter went up on the roof to pray. He became hungry and wanted something to eat, and
while the meal was being prepared, he fell into a trance. He saw heaven opened and
something like a large sheet being let down to earth by its four corners. It contained
all kinds of four-footed animals, as well as reptiles and birds. Then a voice told him,
“Get up, Peter. Kill and eat.”
“Surely not, Lord!” Peter replied. “I have never eaten anything impure or unclean.”
The voice spoke to him a second time, “Do not call anything impure that God has made clean.”
Acts 10:9-15
They all had to be taught the new way of life in Christ!