People leave religion when they perceive it to be causing them more personal discomfort than it's worth. Because people are conditioned to think they couldn't possibly function without it, the notion that they would be better off without the religious cruft is not their first thought, or even their third thought.

I left my religion of origin because its teachings not only didn't benefit me with the promised protection, wisdom and blessing, but almost exactly the opposite. After I left it, I saw to my chagrin how much it contributes to the suffering in the world. Up to that point I would not have credited one of those millions of dead to religion, or at least not to "true" religion (which is to say, my religion).

Not sure that trump was a result of that. It’s not self evident to me which would have been better. I can only hope the next election offers something better for all of us.