God refers to the universal unifying principle of all things- like the energy of the universe. We have "God" in Satanism in that we have our Gods, and also the power of the Chakras which some of the ancient pagan religions referred to as the Gods too. Words like worship, and other terms were hijacked by the enemy and like with xmas, had the enemy draped over them for so long that now the association is of the enemy and the xian program. Worship originally meant focusing on sigils, seeing our Gods within ourselves rather than sitting and spiritually slaving to them which now is the association for the term.
Originally the term God and other things like praying stem directly from our ancient spirituality, but in the same light the focus is not into servitude to "god" but the God power growing within us, and that's the key difference.
When people say one nation under God, they are effectively saying one nation under the Universe, which you can choose to interpret as so.
It goes both ways like a lot of things, you can either be rebellious or just lie low and have the true meaning of the term God strong in your heart and mind. Do whatever you feel like doing, and do it strongly.