Yes populism is overly broad—I think I’ll reword this with a more specific example. You’re right that MAGA is a better example—but do they even engage with their political opponents? They seem to mostly just sort of yell them down. Maybe my theory is wrong?
Religion is a good idea too—you’re right that this is broader than just political ideologies. I’m a bit averse to wading too deeply into the culture wars, my attempt was to try and describe things at a meta level, or at least try to remain not too overtly partisan, so I was wary of attacking people’s religion etc too explicitly.
You can acknowledge critics are deluded or self interested whilst also admitting they have some substantial points—this is more in the vein of using that as a justification to ignore all criticism; even valid criticism.