While there have been people who have done things like this in all ages (and also over believing there is NO God, as opposed to just the wrong one), your statement is not as accurate as it could be in most cases if you take into account the context of those wars.
That said, Benedictine monks would not be at or near the top of my list for people who would get all triggered, angry, and go to war over you disagreeing that God exists.
Yes, people fiercely defend what they love and believe. But it's possible to do so graciously and firmly without being angry or freaking out that someone disagrees with you (I am not referring to you specifically, but you, myself, our readers, mankind, etc).
That said, Benedictine monks would not be at or near the top of my list for people who would get all triggered, angry, and go to war over you disagreeing that God exists.
Yes, people fiercely defend what they love and believe. But it's possible to do so graciously and firmly without being angry or freaking out that someone disagrees with you (I am not referring to you specifically, but you, myself, our readers, mankind, etc).