So Satan sitting in his home listening to the screams of the tormented with a smile on his face, decided the Jews were to close to G-d, and this really angered him, he had to find a way to divide the damned Jews, after all G-d decided they were his chosen people and what better target for his evil deeds than watering down the religion, Now Satan had great power, let us not forget that after all he was arch Angel, most high, one of the three named Angels that sat at G-ds side at one time.
So along comes this good man Jesus was his name, he had many good things to say and the people listened, so first Satan hardened the hearts of the Rabbis, made them jealous of Jesus and his huge following, then Satan allowed some minor so called miracles to happen, an easy task for one as powerful as Lucifer. Satan also knew of the prophecy of the Messiah, and he thought what a great idea if he could trick the Jews into believing that Jesus was the Messiah, he could one, break up the tribes of Israel, really anger G-d whom Lucifer hated beyond all things and of course lead people away from the one true faith of Judaism. Needless to say his plan worked the people of Israel {some} believed the Messiah had come, the Rabbis who Lucifer had tricked into believing this good man was a threat to their power played their part perfectly and had the Romans crucify Jesus {all part of the prophecy} Some years after the death of Jesus, Christianity was born, Jesus NEVER claimed to be a Christian, he was circumcised in the Jewish religion and took Bar mitzvah at 13 again following the Jewish religion. Never once did he or his disciples call what Jesus was preaching Christianity, what he was preaching was Judaism in it purest form, with stress on the 10 commandments as a way to live your life. Did this really happen? I have no Idea, but it is no more believable or unbelievable than Jesus being the Human Son of G-d. Meanwhile we Jews of the one true faith are still waiting for the Messiah to arrive and on that day there will be much celebrating, for we have waiting patiently a very long time for this to happen.