Speaking in a Buddhist way... How many life forms did he have to pass before becoming Jesus?

As God doesn't exist (if he did, he could cure the world of its problems) Jesus must have passed some lifeforms (such as a sheep, fish) before being born as Founder of Christianity. Neutrally, the only way he wouldn't have to be born as any beings is that Heaven (yes, Atheism has Heaven) sent him down to teach people about stuff. So? Any answers?