Good, you agree it was for the Jews. Did Paul ever preach it to the Gentiles? If he did, please show me where you see it.
The baptism of repentance was for the Jews and the "setting aside" of their sins until they were begotten by the Gospel and given LIFE. In the same way, Jesus died for the sins of the world, but there is MUCH MORE, we shall be saved by His LIFE. Romans 5:10KJV Basically it's MERCY compared to Grace. Mercy is temporary until judgment comes. Grace is a gift freely given to those who believe and trust in the Lord for their justification.
Well, here's one...
1 Corinthians 10KJV
Moreover, brethren, I would not that ye should be ignorant, how that all our fathers were under the cloud, and all passed through the sea; And were all baptized unto Moses in the cloud and in the sea;
HERE.....neither of these baptisms had a thing to do with water. Jesus was already baptized by John (according to the law). But, in this verse, He was talking about being immersed in death when He went to the cross. No immersion in water this baptism.
Luke 12:50KJV But I have a baptism to be baptized with; and how am I straitened till it be accomplished!
We see the same here...no water involved.
Romans 6:3KJV Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death?
If water baptism was a part of the Gospel of Salvation, Paul would have included that in his teachings. In the OT, you will see the priests underwent baptism for their office, which, by the way, is why Jesus suffered John to baptise Him. It was a Jewish tradition...no more necessary for us than circumcision is.
Rather than point to a few that Paul happened to baptised certain ones, why don't you show us were you see it being made a requirement for us Gentiles?