Jesus was not a Jew. Why do people think He was?

Jesus’s mother was descended from Abraham, Issac, and Jacob. She was a descendant of King David. If you don't believe Him to be the Son of God, then both Mary and Joseph were from the tribe of Judah and descendants of David. Both of His parents were very confirmative to Jewish law, religion, and custom and a very religious family, so He would have been circumcized. They taught him Jewish law, religion, history, and culture. He is of course the father of the Christian religion, but that religion didn't technically start until after Jesus’ death and resurrection. The Apostle Paul was the first in the Bible to even use the term “Christian” and he wasn't a follower of Christ during the Saviour’s mortal life. Jesus, and all of His apostles practiced the Jewish religion throughout His ministry and nothing in His recorded teachings told them to do otherwise. Everything in the record shows Him to be, in every measurable way, a Jew. If you think that he is not, then you are looking at it from a different angle than the rest of us and you need to elaborate instead of just dropping the claim out there unsupported.