Oy! Think of the irony here...an atheist instructing a Christian on the finer points of HIS own theology.
Jesus and His disciples lived communally. Judas held the purse for the group. Judas betrayed Jesus for a number of reasons, not the least of which was GREED. Jesus had to be betrayed so He could die for the sins of humanity. Jesus died at the hands of Rome, the Sanhedron and the Pharisees...none of which were communistic entities.
I always loved that part of "The Last Temptation of Christ". Judas not wanting to sacrifice Jesus... Jesus all but forcing him to do it.... Just a great spin on the necessity of Jesus dying. What a story.