I already said, he was going to Jerusalem to worship vs 27. That is the clearest indication that he is Jewish.
Jews scattered abroad do make it a point to visit Jerusalem a few times a year during important Jewish festivals. Acts 2:5 indicated that, at Pentecost which is an important festival of the Jews,
5 And there were dwelling at Jerusalem Jews, devout men, out of every nation under heaven.
In fact, Acts 2:5 forms the foundation of my belief that what Jesus meant when he said "all nations" in Matthew 28, is Jews of all nations. This is also reinforced by what Mark 13:10 stated