I kinda hate these types of comics. There really isn’t any reason why this should be a comic other than the writer’s medium of choice. The message gains nothing from the visual aspect. The comic could really have been improved if the author showed what the characters are talking about, but we just get a wall of text with a crudely drawn woman to represent the opposition. Also, the art has no appeal and is generally ugly.
A quick search gives 7% for the proportion of religious wars of all wars, which makes the claim that religious wars killed the most people unlikely.
I hate religion as much as the next guy, but you don’t have to make shit up.