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.

Source?

Military brat here, half the soldiers I meet are massive nerds and the other half are goobers (meatheads, guys with no prospects, guys who always wanted to be in the army). Take that as you will.