Holy Power

[Amos]

...You can't believe you are the one and only true god if you know that you have to fight your way to get there.
Ultimately the Pretender Gods are not enviable beings. They don't have the luxury of faith, they must wage war and commit atrocities and lie and mislead people. And the seeking of godhead itself shows how greedy and selfish they are, or how arrogant they are.

You just described The Old Testament God (read the first commandment) . If the people think they are gods and can work miracles in their name then they are real gods. Or else how do you know that a god is the real god? Monotheistic Gods destroy all opposition, while polytheistic gods fight but coexist. In case of Dominions they are clearly monotheistic gods, so they most certainly see themselves as one true God.