I am not sure about your statement, "..all religion teach to love one another..". This is another misconception held by a large number of people who don't read about other religions and simply repeat what they believe to be true. Two days back I posted an article on dlike.io about people lying to themselves. Very insightful and relevant to our  discussion. Here is the link: https://dlike.io/post/devann/living-a-lie-we-deceive-ourselves-to-better-deceive-others--scientific-american