I've seen a lot of folk here arguing one way or another about whether Jesus was a Buddhist. The argument against is that Jesus believed in God, and Buddhists don't. There is a flaw in this argument.
Buddhism is not a religion. It is a philosophy, a way of living your life. Buddhism has no gods because the greater powers are not part of it in any way at all, positively or negatively. You can have an atheist buddhist, or you could have a christian buddhist, or jewish, or whatever. The only problem is when buddhist philosophy clashes with the philosophy that comes with a religion.
As I see it, the buddhist idea of karma (bad deeds worsening the next life, good deeds bettering it) isn't notably different from the Jew-Christian idea of sin and repentance affecting your journey to heaven or to hell - the next life.
It's entirely possible that Jesus could have been a buddhist, just not very probable.