From what I can tell Nostr is generally regarded as a Bitcoin sect, just as Presbyterianism is regarded as a Christian sect or the Tantric School is regarded as a Buddhist sect.

You've got those popular X Bitcoiners who see Nostr as heretical for various reasons, such as being largely grant funded, not being sufficiently decentralised in practice, having very little in common with Bitcoin at an architectural level and so on (i.e. there's no justification for awarding Nostr the title of "Bitcoin of social protocols"; it's as baseless as awarding Nostr the title of "Coca-Cola of social protocols"). And you've got a lot of Bitcoiners who don't know about Nostr but if they did might not want to be associated with it, again down to the whole 'sect' vibe.

Generally once you're perceived as a sect then it becomes hard to recruit from the wider religious community and your best bet might be to recruit from outside.