Romans, Greeks and the Norse gods Odin, Thor, Zeus etc. they had their place at the time and the death of those civilisations ended them.
Clearly you haven’t grasped American Gods. In fact, I reckon one or two of those gods in your pic appeared much later in that weird 70s book The Joy Of Love.
Godly power is a simple matter of belief…
But being a bit more serious and a genuine question to the believers – is eternal life* a part of your belief and if so, would you buy into it if that wasn’t on the table?
Not as flippant as it reads; I have a genuine interest in the psychology and persistence of belief in the gods/God of any religion.
*By that I mean reincarnation, heaven, hell, the new system. Anything you like!