I've just come back to this tiring thread and, sure enough, people are still trying to justify believing in Gilgamesh despite that there's ZERO evidence (and that there SHOULD BE). The point can only be made again that when you postulate the existence of a very existential thing, there'd better be a lot of evidence around or you look like a mental retard. Gilgamesh (or "God") is something that would produce piles of evidence ... much like suns produce gravity and photons to advertise their presence. It only stands to reason that one of the most important components of the universe would demonstrate that it exists by virtue of some (probably a LOT of) evidence.
Contrast all that with the fact that there's absolutely ZERO evidence for the existence of this Gilgamesh character. And it's not for the want of looking, either. Furthermore, biblical stories don't count, since if they did, then we'd also expect things like flying broomsticks and peculiar "semetaries" where buried pets would come back to life. The existence of Human fiction doesn't prove anything except that Humans like a good yarn.
So, we're back to the hard nugget of truth that puts all the popular bullshit right to bed. Your outlandish claims not only require evidence, but if they're too outlandish (having universal applicability) then by the very nature of such outlandishness the lack of evidence disproves your claims summarily. In short, come back with evidence, fool. Come back with live video of that 900FT-tall Jesus with his flaming sword and only then will your outlandish, outrageous, farcical claims even start to have any merit whatsoever.