Weird, ok, my anecdote flows in almost the exact opposite direction.

I come from a highly religious Christian background and moved in the other direction without any ill will, most of my religious male friends who have families have confided in me that they think monogamy and general family values are worn out cultural artifacts and clearly regret buying in even though they love their kids and are entrenched in their communities.

Many already have a first divorce under their belt.

Meanwhile my atheist friends had their first kid right around 40 and are somewhere between 1-3 kids and after a fair amount of relationship churn when they were younger are now in very stable relationships, some very orthodox and a few semi-orthodox.

If the trajectory hold for this generation the same as I saw for my religious parents generation I think the trajectory looks not great for mental health on the religious side.