Christianity is the same religion as the Jewish religion of the Passover. Jesus was a Jew, as were the Apostles. Christianity is not a new religion, it is a continuation, a fulfillment, thus the reason our Bibles have the same Old Testament books as the Jews.
How do we know who Moses was? Because tradition, witnesses that were there and passed along that knowledge. Same for Abraham, Isiah, etc… each new prophet did not come along and rewrite who the other prophets were known to be or what they said. They all fit like a glove, all in harmony with one another. Also, was not each prophet a practicing Jew as his ancestors before him? Was Mohammed a practicing Jew? I do not believe He was. In my opinion, and in accordance with history, he does not fit in with the other historical prophets of the OT.
That’s why I say how can someone hundreds of years after Jesus answer the question of who Jesus was. It is impossible without the testimony of witnesses who were there. Those witnesses didn’t become martyres because they thought Jesus was just another good prophet, no, they were killed because they believed Jesus was the Son of God, the long awaited Messiah. And that is why Jesus was crucified upon a cross.
Do you believe Charles Taze Russel? Or what about Joseph Smith? They too tried to rewrite who Jesus was long after the life of Jesus. Christians can answer to who Jesus was in every generation, non stop all the way back to Jesus, there are thousands of documents to examine.
I’m sorry if me using all caps on words offended you. I wasnt trying to yell or be uncharitable, I was just putting emphasis on certain thoughts.
May God bless you and peace.