Yes religions can be abused by misguided people, but so can political systems. Any congregation of human beings, whether it's religious or secular, is susceptible to succumbing to the mentality "us vs. them" - those who hold the same beliefs as you vs. those who don't. Let’s say we abolish all religions, what I think will happen is that the bigots will find another way to brandish their bigotry, and the terrorists will find another justification to terrorize the world anyway. Self-righteousness is everywhere. Corruption is in any number of things we imperfect humans engage in. Political beliefs are just as easy to pervert to evil ends as well. It's a people problem.