For one thing, explain to me WHY jesus dying redeems mankind. Seems like a huge leap in logic to me.
Secondly, how can we know his death causes christianity to take off and become so popular. The religion and social movements became strong and then they decided to name it after just that one guy who died. They crucified a lot of motherfuckers back then.
Thirdly, why are we giving him so much credit for dying? "Let's see, I can stay down here for a while, where everybody hates me, i'm misunderstood, everybody walks around with open sores on their feet, their syphlidic, they're protein difficient, I can't eat one meal without getting sand in it, so I could stay here for a little longer... or I could be martyred... go up to heaven, where all my pets are, apparently, and sit at my fathers side in judgement of all of man kind for the rest of eternity. Hmmmm, *motions a balancing with two hands* I wonder which- Okay! Okay guys. I'm ready! What do you mean you've only got three nails? Well do my feet like this. Let's go! Less time here, more time there... in heaven." - David Cross.