God is that "thing" that, to the best of your knowledge, is at the top of your hierarchy of values.

If you envision that as a bearded man who lives in the sky, then that's your God.

If, for you, it's, say, verifiable fact, then verifiable fact is, functionally speaking, your God.

If it's freedom from Gods, then that's your God!

If your highest value is doing as you please, then that's your God.

If you'd prefer to use a different word, then by all means, do so, but either consciously or unconsciously, you still have a highest value, and you still relate to it the way humans have related to Gods since we have existed.

I don't think there's a bearded man in the sky. But I'm thoroughly convinced that all conscious humans have a system of values, and that some of those values are regarded with greater deference than others. And the one, or few that cluster at the top, function in our lives the way gods function in our mythologies. If you live in defiance of all things other than your own whim... then you have deified yourself.