As an atheist, Americans not going to church is detremental to society.

So Americans have been going to church less and less frequently, with attendance being at all time lows. While part of this is from a decline in religion in the United States, even religious people are attending church less frequently.

Personally I don't think the lack of religion among people is bad, people don't need to be religious to be good people. That being said, beyond just religion, church fulfilled a lot of important roles that have died out in the modern era. (By church I mean in a non-denominational way, I'm including Christian church, Jewish synagogues, Muslim mosques, Buddhist temples etc).

It was a place that you could visit every week, full of the same people to build bonds with. Americans don't have third places to go outside their homes that aren't school or work anymore, and church was a huge one. It's a place to meet people, make friends, meet romantic partners, etc. If one person had surgery, or a major catastrophe, the rest of the church would make casseroles for them, and lend a hand.

There were numerous free or cheap community events like BBQs, picnics, classes with the church, daycare, events, etc. Churches also often did volunteer and charity work. Things like feeding the homeless, women's shelters, group funds if a member has their house burn down, or is diagnosed with a disease.

Overall I think the loss of a place where people could meet every week has had negative effects on society.