hijack religion for their own murderous ends". Obama's point is very clearly that the actions of ISIS do NOT represent the religion of Islam, no more than the actions of the Ku Klux Klan represent the religion of Christianity. Obama's point is that people have done evil acts in the name of religion all throughout history, and no religion can claim to be free of such associations.
Honestly, I'm not really sure what you're trying to say here, nor did I miss the fact you only talked about the Crusades and ignored his comment regarding slavery and racism, likely because it didn't really make sense in the context of what you were trying to say, which I don't feel really addressed what Obama said.
Women (Nasty or otherwise) are going to be the reason that Donald Trump is NEVER President!