Yes. The crusades were based and necessary. Do not discount the sacrifices our ancestors have made for us. Were it not for them, Spain would be a Muslim country today, to cite just one example.

That depends on one's understanding of the teachings of Christ. I would argue that I'm extremely Christian and that most people who claim to be Christian don't even understand their own tradition. If you want my thoughts, I offer them in a pretty thorough articulation in the youtube video linked in...