Certainly there is a lot of poverty in many South American countries, where the majority follow the Catholic faith. Naturally there are ''fat cats'' too but they are in the minority. Bigger families obviously contribute to family poverty but only the most ignorant don't know how to limit their families.
I was surprised to see Islam mentioned in the same way, I don't believe Muslims on the whole are thought of as poor. They may live in a country where there is great poverty for various reasons. Some of the Muslims who live is what might be called ''Muslim areas'' in this country aren't particularly well off but they are aspirational and not on the bread line. 'Working class'. Our new mayor comes from that sort of background. They aren't known for having big families. Plenty of quite well off and well educated ones too, who send their children to the top schools.
The Indian subcontinent is so vast with remote areas, places where there are floods and droughts, there's bound to be extreme hardship but not necessarily connected to religion. We mustn't forget the Zoroastrians who are considered to be elite, not many in number but highly educated, enlightened and aspirational, especially for their children.
Hindus in India and abroad have a huge demographic and, again, aren't known for having very big families.