That's a contradiction. If you can't know anything for sure, you can't know this for sure either.

I think you're just splitting hairs now. There's no need to absolutise everything. I meant this more like a general direction. Like an overall guideline. We can't know anything. Who knows, maybe all this is simulated? Maybe I'm dreaming all this. Or maybe I'm just a hallucination of the God. However, if I see that it rains outside, for all intents and purposes, I do know that it rains outside. There are various levels of truth and reality.

The only Church that meets this criteria would be the Eastern Orthodox.

Well, I'm not in that camp although I do live in a country where Eastern Orthodoxy has significant amount of followers. That said, even Eastern Orthodox is not quite monolithic. There are Old Believers and there are general Eastern Orthodoxy, different countries practice differently, it is influenced by politics and so on, and so on.

That's a contradiction. If you can't know anything for sure, you can't know this for sure either.

I think you're just splitting hairs now. There's no need to absolutise everything. I meant this more like a general direction. Like an overall guideline. We can't know anything. Who knows, maybe all this is simulated? Maybe I'm dreaming all this. Or maybe I'm just a hallucination of the God. However, if I see that it rains outside, for all intents and purposes, I do know that it rains outside. There are various levels of truth and reality.