I hate how people have and are using religion as a sort of leeway for killing the people they dislike (terrorist groups for example).

Things such as right and wrong do not need to be affiliated with religion to exist. I don't think we need religion to define those things either. It's more based on empathy then anything else really.

Someone takes your shit, you don't like it. It is BAD. Someone hurts you, you don't like it. It is BAD. We don't need the Bible or the Tanahk to tell us this.
Of course, if you are some crazy mental dude who loves killing and pain, well this doesn't apply to you XD