If you come from a American Christian background these are really worth exploring. Being ex-catholic/ex-Christian I found that they share enough to make them more accessible (I guess) than other religions, but also different in thought from what I grew up in, and those combined really help me expand on my personal thinking. I did a study group that a Greek orthodox priest put on for non-orthodox and it was awesome. Watching him shutdown old school American Christians and their focus on decoding a few sentences in English when he pointed out 'that's not even really what the words mean in the original text' and then getting mini-lessons on old languages and meanings I felt like I was back in school and completely changed a lot of my surface level understand of Christianity (asking my family religious questions the answer was don't questions/it's this because it's this).

From the comments here I think I'm going to look into the Indian off shoots. Up until now I've mainly explored through Egyptian, Syrian, and Greek/Russian orthodox friends. I wonder if there is an Indian style church established in the US that would have literature created to be accessible to an American church centric point of view? I've always envied the deep spirituality my Indian Christian/Muslim friends have had, I wonder if exploring the Indian church could help me with that. I did a couple year long study with a Pakistani Muslim friend but I didn't really connect with it, though his beautiful spirituality/groundedness/family beleifs have been a godsend as a life mentor.