That's just a subset of the general proposition ─ to identify and reject propaganda, unreason, improper persuasion, regardless of the topic, regardless of the source.
There are versions of evangelism in politics, pop, advertising, nearly all human activities.
By metaphysics, I take it you mean supernatural metaphysics. There's also a branch of philosophy called metaphysics that deals with non-supernatural questions ─ as the late David Armstrong put it:
there are a great number of notions that [...] we can call topic neutral notions. Instances are cause, class, property, relation, quality, kind, resemblance, quantity, number, substance, fact, truth, law of nature, power, and others. These notions are perfectly general, are very difficult to analyse and interconnect, [...] It is these sorts of notions, I suggest, that metaphysics strives to give a systematic account of.
Following an idea of Descartes, though with variations, I assume that ─
a world exists external to me
my senses are capable of informing me about that world
reason is a valid tool
and I assume those things because in each case I can't demonstrate it's correct without first assuming it's correct. However, anyone who posts here affirms by so doing that they agree with the first two, and fingers crossed they also agree with the third ─ so our conversations have a common basis. Indeed, I've yet to meet anyone who doesn't, explicitly or implicitly, agree.
So science sets out to explore, describe, and seek to explain the world external to the self, aka nature. And the vindication of science ─ as with all forms of reasoned skeptical enquiry ─ is that it works better than any other system we presently know of.
And it turns out that we find nothing supernatural in nature. The only manner in which the supernatural exists is as sets of concepts and imagined things in individual brains. And because these ─ unlike eg science ─ have no objective standard of truth, there are, for example, tens of thousands of versions of Christianity, and Christianity is only one of the world's thousands of religions.
The realms of religion look more like Captain Marvel vs Godzilla vs Gulliver vs the Three Bears.
So I continue to be happy with reasoned skeptical enquiry.