Well, this is how you would explain it to a dim-witted person... In a way...:
Many years ago, around 50 or so BC... (I might be off by 100 years or so.)There was a Jewish Rabbi who had a student (Jewish: "Talmud") That student (who was Jesus) was around 17 years old and was one of the greatest "learners" of all time. He studies something that Jews call "Kabala", which is a section of learning that discusses what this world is, and everything in it. It shows you how to palm read, like the long line next to your thumb is your lifeline, etc. So this student was tall, handsome, strong, amazingly intelligent, and healthy: Exactly what the Jew's Messiahs description is.
So this Student declared war on the enemies of the Jews, and he pretended to be the Messiah. Many people followed him because he was the perfect Messiah.
In the end, this Jesus, made a religion that he thought would join Jews and other people together: Christianity. This was totally wrong according to the Jews Bible (Jewish: Torah), so he was cut off from the Jews religion.
From then on, Jesus tried to war the Jews etc.