Normally it’s bad form to comment on receiving downvotes but in his case I’ll point out that I spent a lot of time in such a country as a kid as I have a parent from that country (although said parent had only two siblings and their family didn’t practice bride price / have kids work to support family etc).

Not all reasons for having a large family are religious; some are just desire, of course, and some are indeed economically rational. That last is part of the reason, I believe, that birth rate drops as wealth increases, and is yet another reason to try to increase wealth for everyone.