I would expect Vogg (Vitek's brother) from Decapitated to just join another band.
Black Dahlia murder aren't really deathcore but they are meh. I saw them live once and it was okay, I don't really like their music but it was fun to knock some kids around to. The one kid that was hardcore...
I would call the big 3 Christianity Islam and Hinduism, Hinduism is way larger than Judaism. There aren't a lot of Jews...
But I think religion is a natural response to the unknown. However, in modern times we now know much more than 2000 years ago (way more in the case of Hinduism)
I think...
Dream Theater has so many awesome albums, the best imo are Images and Words, Awake, A Change of Seasons, Train of Thought, Scenes From A Memory
A Change of Seasons is such a badass song
YouTube - Dream Theater - A Change Of Seasons (Part 1)