In my experience, this usually fills in for something that people need to be true.
I’m not religious, but I’ve noticed religion can (successfully) act as a mental buffer to help people through hard times. To keep them from simply clocking themselves out during the lowest of lows.
Whether someone else likes that idea or not because it’s “lies” doesn’t really matter if it’s a technique for pure animal survival that works for some members of a species.
Personally, I’ve seen a lot of damage done to perfectly good people done via religious institutions, so I’d prefer if a formalized network of mental health services that was affordable and accessible existed. But, again, my preferences for the type of system that performs a function aren’t going to erase what happens in real life with real people faced with survival problems on the ground.