Not only was Jesus Jewish, virtually all of the first Christians were Jews and about the first 10 Popes were Jews.
In fact, one of the original Christians (Peter) was a bit dismayed when he found out Gentiles could become Christians too.
The Christian Eucharist was instituted “in the night in which He was betrayed...” which was the Passover.
That is why we southern Baptists give so much weight to Paul... Antioch and the non Palestine Jews who came to minister to the goyim