Christians have done a good bit of violence, including the crusades and Hitler and Putin calling themselves Christian. I think Jainism might be the least violent of the major religions.
The ideology of vegetarianism is extremely destructive. Particularly for humans.
It is no coincidence that Hitler was a vegetarian. The roots are extremely similar: a deep hatred for humans, to the point that animals are declared not only equals but even better than humans. Hitler loved his dog more than any human; it just reveals a deep truth about his motivations and behavior.
You may not have researched or thought about it a lot but I can assure you this is a very valid observation.