God did not kill his Son. People killed His Son. God sent his Son for us, to show us the way to Life. He knew what would happen to Christ, yes, but that is not the same as causing it to happen. If it could have been any other way, then I believe it would have been...because Jesus asked His Father to take the cup away from Him, if possible. I might not understand everything, but I understand that much at least.
Yes, fine, but isn't that cheating? I mean, Jesus was resurrected after being put to death. The forfeited life is the ransom paid in full. The life was not actually forfeited and no actual ransom was paid if Jesus just gets to be resurrected and skip on his merry way while we all get to suffer and die with some lame promise of eternal life in heaven or paradise earth, take your pick, with absolutely no precedent to back it up. We are the ones whom the ransom was paid for. God made off with the ransom, the Indian Giver, and left the victims behind to remain suffering in the hands of the extortionists. Awesome god!