Most people think they deeply believe things, and that there is some kind of ultimate truth which cannot be negotiated. One comes to see themselves as an extension of a shared identity within a given ethical, moral, and theological/philosophical construct. People believe themselves to be superior to others who almost believe exactly the same thing as them, but not quite, they didn't 'get there'.
It's extremely exhausting, and so you have to go to war with these people, time and time again, because they are deeply self-centered and passive-aggressive. Or aggressively passive-aggressive (backhanded(.
Because there is a flow. There's just this fliw, and things are obstructing the flow, as if they can make the stream reverse course by swimming against it.
It also helps if you have a Messianic, apocalyptic conception. Jesus didn't believe in a Messiah, he thought he was one (or he was, whatever, however you see it is fine). That's way less offensive than believing in one. Either you are or aren't the Messiah. Otherwise, please stop it.
The other aspect is cruelty. People these days always talk about 'harm', which could be anything, properly defined, but real cruelty doesn't really need to be defined. People don't like that. So when someone wants to blow up your country because of it, don't be surprised.
You have it in reverse, limited resources actually causes excess population. When there's nothing else to do, people f*ck.
Of course famine and political pressures which lead to that, are a factor. However, the real resource is cultural, it's mental, it's 'potential'. It's freedom to create something new and interesting.
When theology and politics collude, there is an integral degradation of mental resources. People stop thinking, and become drones, bots, npc's. They are stripped of their potential. They react in a variety of ways, one of which is the enslavement of women for the function of reproductive activity—which we might owe a debt of gratitude toward.
Summarily, the darkness born of ideological theology (as opposed to cultural theology, which binds people together informally), leads to population booms, and as a product of last resort, people reproduce as a means of coping, without the accompanying intention of reproduction...
The most stable demographic regions of this world are also the least economically developed. As an example.