I think you are right in that in theory you could have "all that stuff" sans religion. And in fact I think Atheism in the boomer generation benefited from cultural inertia - like, you could say you don't belong to a religion but still marry, have kids, participate in community etc simply because that's what everyone else (by the virtue of their religion) was doing around you.

But today it seems like critical mass is elsewhere, and it seems like the religious folks now have a huge advantage over everyone else in terms of marriage, family formation, community and maybe even mental health. So while in theory it's possible, it seems like in practice all of those things declined among the non-religious, just perhaps with a lag of a generation.

The reason I think it might make sense to reengage with religion is the crux of this question: does life have a point, a meaning, etc. Not even "what" the point is but does it exist at all. The idea that the universe is a total accident and nothing is relevant takes you in a certain direction in life and society, while the idea of "there's meaning and purpose" in another.

I think it's hard to anchor your life in the value of meaning without logically accepting a creator of that meaning.

So I think there's an element of faith - either you chose to believe there's meaning or you chose to believe there isn't, everything else is implied by that choice of belief.