We do have the right to be stupid and superstitious, however this is not and never has been a Christian nation. It's a Democracy not a Theocracy, if you want one of those try Iran.
While I take acceptance to your "stupid and superstitious" comment, there IS evidence that many of the founding father's were in fact Deists and not "Christians."
OTOH, I think the point of the previous posts is that the population is comparatively Christian.
And your final statement in syllogism form shows that it is self-contradicting to the end of your first:
This is not a Christian nation
It is a democracy
Therefore it is not a Theocracy
You see, a Theocracy, by definition, is a government based on God as its head.
A Theocracy does not necessitate "Christianity," but a God (the First Source, if you wish).
Which, by definition is Deism, which many of the founding father's in fact were.
Not to mention that this country is supposed to be a Republic, not a Democracy.