Don't need to. Another poster already did.
Yes, Jesus was a Jew. Virtually all modern historians and biblical scholars agree that Jesus of Nazareth was a first-century Jewish man who lived, taught, and died within the context of Second Temple Judaism.
Evidence of His Jewish Identity
According to the New Testament and historical records:
Ethnicity: He was born into a Jewish family of the Tribe of Judah. His lineage is traced back to King David and Abraham in the Gospels of Matthew and Luke.
Religious Practice: He was circumcised on the eighth day according to Jewish law. He regularly attended and taught in synagogues and the Temple in Jerusalem.
Festivals: He observed major Jewish holidays, including Passover, the Feast of Tabernacles, and Hanukkah.
Teachings: He operated as a rabbi (teacher), basing his teachings on the Hebrew Scriptures (the Torah and the Prophets). He famously stated that he did not come to abolish the Jewish Law but to fulfill it.
Relationship to Christianity
While Jesus is the central figure of Christianity, he was not a "Christian" in the modern sense because the term was not used until after his death to describe his followers.
Foundations: Christianity began as a movement within Judaism led by Jesus and his predominantly Jewish disciples.
Separation: The two faiths gradually diverged over centuries as Jesus' followers (who came to include many non-Jews) identified him as the Messiah and the Son of God, claims that traditional Judaism rejected.
