The crusades weren't a Sunday barbeque...
No, but they weren't anything to do with Christianity, either. It was a political objective (conquering the Holy Land and defeating Saladin) that was justified by claiming to be the will of God (the only way that soldiers could be recruited for the task). That is the thing with atrocities that have been committed in the name of Christianity - none of them are sanctioned by the book. That is also why you don't see Christians martyring themselves or declaring holy war - it is inconsistent with their faith.
The crusades are still on ,nothing changed exept the weapons and technology.
Assuming that you are talking about Iraq - I can't imagine what else you could be talking about - that has nothing to do with Christianity either, that is all about oil.
The humans do not deserve the Earth....
True!