Some churches have done evil things, others have immensely benefitted their community. Arguments that uniformly paint independent groups of people with a broad stroke of immorality are usually irrational because people aren't monoliths and don't behave a single way, especially churches which are operated in a decentralized and independent fashion (eg my small city has 50+ churches, all operated by separate groups). OP's comment is just as irrational as the people who say "all women are x, all minorities/white people are y, etc. The fact that some people may subscribe to these irrational beliefs is neither here nor there.

Irrational is one who believes in things without evidence, aka faith.

Well, if you want to go down that road, someone's belief that they identify as a woman despite being xy is also irrational...