I'm tempted to think that the correlation isn't religion per se, but rather a pragmatic attitude towards the 7b people on the planet today. If you're reasonabl

I'm tempted to think that the correlation isn't religion per se, but rather a pragmatic attitude towards the 7b people on the planet today. If you're reasonably 'rational' (but not especially religious) you're not going to look at those numbers and think procreation is compelling for the sake of keeping the tribe alive. OTOH if you're thinking that your particular religion needs a numbers boost, then the imperative may feel differently.