The bloody religious wars

The purpose of religion is to teach people how to live their lives well. But in history the dirtiest wars fought are the religious wars. Religion never focuses on how to bring about death but cherishes life I would think. The religious leaders have failed miserably. Some advanced religions respect lives of plants and animals but most major religions respect human life. It is supposed to be of the highest order. But everywhere people die in the name of religion. This is because people who propagate crimes in name of religion feel righteous because they think that they are doing the work of god. Its best if the reasons of greed and mean mindedness are cited than religion. Intolerance comes from insecurity. The idea is to get a gang to look down on a concept that threatens you personally and hence feel stronger.