Except they are extinct, by their own hand. If they are like the Christian God like you believe, they would have some sort of presence. They don't. Because they believed, the only way to stop the flood was to destroy ALL sentient life. The saving grace was that they had secretly compiled all dna of those sentient beings and sent them back to repopulate EXCEPT for themselves... Why? Also, IF they are omnipotent AND their main purpose for destroying life was to destroy the flood, then why haven't they stepped in again to finish the mission?