It was really pretty typical of the primitive cultures of the time. The Mayans were sacrificing people to their gods, the primitive Celts loved a bit of human sacrifice, or so we're led to believe. The Romans sacrificed anything and everything to their Pantheon of gods.
The only real difference is that the bible claims that Jesus was god. And also a man.
Let's think about this for a minute. Jesus is the son of God but he also is God.
God is all powerful, all knowing and all seeing. He has a plan for us all and yet still allows us free will, that's how great he is. He can do two completely opposite things at the same time. Wow.
As far as I can see (assuming that it's not all just bullshit of course) the whole thing with the cross, the crown of thorns, the spear and the sun burn was nothing more than cheap theatricality designed to impress the primitive, unwashed, uneducated peasantry of the time.
Suffer? He's God, he can't suffer.