On the one hand he might really believe he’s trying to help you, that concept goes deep and he has millenia of social proof he’s right and a whole culture founded on the idea of looking out for people and that Christianity is the baseline to which we compare other things.
But it does seem like he’s using this to plaster over the cracks.
if you can separate how much is you wanting to put your beliefs in him, you’ll be able to come at this cleanly, but people often get a bit enthused about a new thing, whatever it is, then slowly they integrate it when it fails to solve all life’s problems (unless it actually does, but very few philosophies will for most people) and settle back to a balanced state, keeping what works and discarding what doesn’t.
You can help him out by maybe having a chat about how faith comes from within, you’re glad he’s foind this and it’s making sense and you’ll certainly keep an open mind, BUT, at the same time because faith can’t be faked can he please just lay off in your presence.
That respects he thinks he’s saving you from literal eternity in hell, he’s just trying to be a good mate in some ways, though he also probably subconsciously needs to get people to join him so he feels affirmed in this radical new worldview.
Or, tell him outright, you aren’t at a point where this is making sense and can he please dial it down.
IMO if you cut him loose, you’re handing him over to deeper immersion, though it may become necessary for your own wellbeing later, if you can avoid it, he’ll probably come down at some point, and be glad to have a friend outside it all.
That’s just some thoughts, hard to say without really knowiung the personalities involved, but remember no religious person is consciously trying to fuck with you, they truly do think what they’re doing is right.
That’s why these book cults with a perfected man or perfect way of life are so fucking toxic, they don’t just help a person cope with life, they actively mandate forcing the ideas on other people… 