If the Jesus of the Christian religion never actually existed,why didn't rabbinical sources which denounced...?

Jesus of Nazareth was an actual person, well-doented in multiple sources. Besides the Bible, Josephus the historian (a Jew) wrote of a Nazarian who stirred up trouble with the local Jews. Scholars don't debate whether or not Jesus existed, they know he did. The religious debate whether or not he was God's son and ascended into heaven, not whether he existed or not.