One thing atheists often ignore is that being part of a religion means being part of a community, a group. That alone is reason enough for many people to stick with it.
Sure, the preacher/priest/whatever may be a scammer asshole, but this isn’t about him, it’s about me and the people around me. I belong in here and so do these people.
Remember, humans are social creatures. Being part of a group is a big fucking deal.
Another thing I’ve been giving some thought, religion can be a “lazy shortcut” for the brain to acknowledge some stuff without having to spend too much energy thinking about it. It’s a lot easier to wrap your head around “Because God wants it” than digging deep into the hows and whys of anything. No, it’s not scientific in the least, but humans are lazy. I am lazy, you are lazy, everyone here is lazy, we just opt to save energy in different things.