As religion has shrunk in participation in most of the west, it has become hugely susceptible to manipulation. My wife (now atheist, but grew up evangelical) often has to correct me when I make snide remarks about Christianity. Recently I made some comment about hypocrisy amongst Christians for supporting a multiply-divorced man who bragged about groping women for president (who has probably never read the bible), to say nothing of the people around him. She quickly snapped back at me that "they actually see themselves in him, have you not noticed all the sex scandals that happen in so many churches?" and then went on to list the "questionable" relationships in her own youth group. (I am NOT saying all Christians are like this, but religion is often used to cover up or excuse misdeeds).
It is not unique to Christianity or even Islam, though. You're seeing a lot of religion being used to justify many terrible things, including many smaller ones in Africa and Asia that have been used to justify atrocities and genocide.