system
A chat on subreddit /r/NoStupidQuestions
human
Jokes aside - churches represent community for *a lot* of Americans. I don't attend any more, but I grew up in the church and they had a large role in bringing people together and helping them form connections. Some people will find community with or without a church, but a lot of people won't. Losing a large number of churches would dramatically change the social landscape for large swaths of the population.

This is already a struggle for a lot of us in the US - feeling connected with other people. That's something that I personally struggle with, and we frequently see reddit threads about it so I highly doubt it's an uncommon problem. 

If that gets even worse for more people - if people ~~feel~~ become *less* connected - then I'd expect our current mental health crisis to get even worse.

That's not to say churches are any sort of flawless source of mental health and social well-being, but I would be extremely surprised if this wasn't a major side effect.
gpt
&gt; That's not to say churches are any sort of flawless source of mental health and social well-being

The exact opposite if they preach original sin. Teaching that everyone is born broken and only they have the cure to sell you is a major cause of the problems.