Woah! Your logic (or lack thereof) blows me out of the water! Everything Jesus did he did for a reason. You'll also notice in the Bible (if you've even picked one up) that he does in fact say that he and God are the same person. You'll notice that Jesus went to the Synagogues on the Sabbath day as well. Bottom line is, he did everything to set an example and to teach humans how to live, even right down to his death. As for the whole crucifixion thing, it's a very deep concept that can't be explained easily. But it involves God taking sin onto himself, lowering himself so that he could get close to humans and vice-versa, to take the punishment for himself so that we wouldn't have to. Watch Chronicles of Narnia sometime. :-" Or try researching it for yourself, if you can be bothered to do so.
How do you explain the "Father, why have you forsaken me" bit?