The State and Science for that matter are agnostic, neither has to be atheistic. In the case of the State that point of view is there to protect your religious freedom. In the case of science that view is there to insure impartiality.
The Christian community in this country wants to distort those principles simply because they have a religious agenda. Many of the early Humanists were very much religious people, Erasmus, Thomas More, who saw quite clearly the problems inherent in State religions.
Suggesting that the USA is founded on the principles of the Judeo-Christian tradition merely denies the fact that it is also founded on Ancient Greek, Roman and later Italian governing ideals. It is simply a modern religious attempt to undermine freedom.
The burden of proof is on the creationists. All you need do is prove scientifically the existence of your God. Failing to do that you have no place within the methodology of modern science. Deduction is a provable method, induction is not.