Secular societies tend to fall into much lower birth rates. They don’t reproduce themselves.
That’s one of the most damning things you can imagine, actually, about a society.
Religion, even adjusting for income, has predictive power over the birth rate.
It’s one reason why America still has a stable or a typically growing population, along with immigration.
And American religion has stayed remarkably strong for our level of income. It seems almost obvious to me that’s a positive
Fundamentally: Does the belief lead to a society that reproduces?