“But Christianity is nothing more nor less than the fulfillment of Judaism.”
Correct that Christianity is the fulfillment of Judaism. Incorrect that it is no more. Because Jesus Christ came to save all of the world, and sent out his Apostles to the world.
“Judaism was 100% about Christ, and how to know him when he came (and comes again).”
Jesus Christ has arisen.
Rather, “incorrect, that it is nothing more...”