but your hypothetical question is moot because Satan is "God" in a way. If you want to worship Satan, you are free to do so... and Satan is your "God" so "In God We Trust" can apply in your case.
I am not going to change the word of "Buddha" into a "God", nonsense.
I'm wondering why are you specifically targeting Christianity as seen in your previous posts? Mind you - Christianity is not a national religion as chosen by American government.
But they are acting like it was, even though I am not taking the Christianity as target, although they just kept acting like Christian is an nation religion and tried to keep the word, "God".
your concern is fallacious since public schools nor government do not force people to celebrate those. Just because you had that bad experience at school does not mean there is a government policy that mandates the enforcement of observance of religion/holiday.
They does party the Christmas even though there are the students who don't believe in Christmas, but the students are scheluded to go to that classroom, what are the students supposed to do?
I am sorry, but I don't see any freedom of the governments using the religion on people.
do you? 
Have you any source for this? 

