Christ is the Second Person of the Holy Trinity. He entered the world during the time of the Roman Empire, becoming one of us. He died for our sins and rose again from the dead.
These things were not done in a corner. We know far more about the words and deeds of Jesus the Christ of God than we know about any other historical figure before the invention of the printing press.
Identifying Christ with the Mithraic Bull cult just because we took over a pagan holiday is a ludicrous act of God-denial.
Thank you