I think this question is very dependent on who you ask personally I dont think its dying out but I definitely think it's less of a key aspect of society then it ever was. I think this because being apart of the the younger generation we have been taught to question everything, and religion doesn't always have the answers nor does it line up with alot of morals that people have.
i don't know this is just my opinion I hope it helps!!
A. Women marry later and have fewer children, usually this is not the case, the women will marry earlier and have lots of children in places where they are not educated.