Polytheism ruled the earth untill Abram (not yet renamed Abraham) hit upon the revolutionary idea of 'One God'. He petitioned this God and This God made Himself known as much as was possible to Abram. Thus began the unfolding of The One God's will for mankind.
You conveniently discount all this because it makes things easieir for you. You owe nothing because you deny the existence of a personal God who might make demands upon you. It's a game many play and you will not gain eternal life (whatever that is) if you stick to it.
God never said that there are not other gods. In fact, he told us to "have no other gods before Me."
A god is basically anything that we willfully promote as more important than the Everlasting Almighty Everlasting Father Mighty Wonderful Counselor God.