I don't give a fig about what the Jews do, did, or believed in. I was talking about baptism in water which a believer goes through in obedience to God's word. It is not necessary for salvation, but it is necessary to make us understand what happened in the Spirit. We are born again by faith in Christ, we are baptized by the Holy Spirit by faith, and we are baptized in water through faith in Christ.
LSB Acts 16:30-33 And after he brought them out, he said, “Sirs, what must I do to be saved?”
31 And they said, “Believe in the Lord Jesus, and you will be saved, you and your house.”
32 And they spoke the word of 1the Lord to him together with all who were in his household.
33 And he took them that very hour of the night and washed their wounds, and immediately he was baptized, he and all his household.
Matthew 28:19–20 (LSB)
19 “Go therefore and make disciples of all the nations, baptizing them in the name of the Father and the Son and the Holy Spirit,
20 teaching them to keep all that I commanded you; and behold, I am with you always, even to the end of the age.”