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.

I'm not splitting hairs. The position that nothing can be known for sure and that everything may be simulated is self-defeating because if that were the case, your belief that everything is an illusion is also an illusion.

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.

So you choose to trust your senses. But on what grounds? How do you determine what the levels of truth and reality are when you yourself are limited by your subjectivity, physical/temporal existence and senses?

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.

There is only one EO Church and different dioceses are in communion. Their differences are not theological and are covered under what is called oeconomia. A Russian Orthodox person can go to an Orthodox Church on the other side of the world in Africa and get communion there.

Old believers are considered schismatics, although they may have a point. The thing is there can't be more than one true Church.

PS: If you're curious about why the Orthodox Church is the true one, I recommend checking Jay Dyer's videos on the subject like this one: https://www.youtube.com/watch?v=EUvWvabTkPY