For what purpose does God exist, if he exists?
So this particular question came to my mind, after watching a OVA of Saint Seiya (a popular Japanese anime in Asia and Europe, not in North America though), when the featured goddess Athena (more of a stereotypical Protector of Earth idea, not to be confused with the real Athena in Greek myth, though she is modeled after) asked this question to the Gods of Olympus who were prosecuting her Knights for fighting against the divines: "why do Gods exist? They exist for the humans. Therefore, Gods can also be said as the servants of Men."
For what purpose does God exist then, in today's religions? There are of course a million sociological/athropological, political or even (since all have been trying to use) scientific reasons. But let's for the sake of argument say that God does exist, then what's the purpose of existence? All religions endeavours to put purpose into our life, so what's God's?
And if God just..exists. Can't we come back and say, similariy, humans can just exist...without a purpose and therefore God doesn't exist?
And is that above answer posed by the Athena in anime also the answer to this question in the general context?