Not a church-goer myself, but I can relate to how mind-numbing that type of chatter can be! It seems to happen when women of socially-acceptable childbearing age gather in any sort of group setting. The automatic topics seem to be 1. children, 2. anything child-related, 3. bitching about husbands/boyfriends.
The first two bore me to death, and the third disgusts me. I have certain friends that I will vent to, but I am VERY careful about keeping relationship things as private as possible. I have maybe two friends that I will go to if I am working out a conflict with the spouse. I never bring up private things in a casual, public setting like that. And the tone most women use when in partner-griping mode is very condescending, like he is a child who has to be managed. Ugh.
Oh, and the labor stories! I do not give a rat's ass how long you were grunting and sweating to give birth to little Sneaugh'flayke! I don't care if s/he was caeserian or vaginal birth! I don't care who was there or what they thought of it!
I always, always change the subject. If that doesn't work, and I am not in a position to leave, I tune them out and do my own thing.