> The whole U.S. is established on the idea of God and religion
I am not sure what you mean by this, but I'd like to disagree with how you have framed it.
In its essence, your comment is factually incorrect, but I will concede that such notion may be derived from observing elements of the culture and government as we know them today (e.g. notes on currency, addition of "Under God" to Pledge of Allegience). Without a doubt, that religion or concept of a God hold strong and there's a variety of individuals and organizations pushing for its inclusion in government operation and its laws.
It has not been established on the idea of God and its religion however (by the way, which religion do you mean), see separation of church and state: http://nobeliefs.com/Tripoli.htm.
> tells you to pray towards said imaginary person and completely disregards science in favor of what someone wrote on paper 1500-2000 years ago
While science cannot prove nor disprove existence of God, while there's a conservative religious following to discredit or "adjust" science to further its own goals, it is factually disingenious to suggest that Christian faith commands to completely disregard science in favor of some text.
It is sad, however, that what the evangelical conservative Christians do is to promote this type of interpretation among non-Christians, which affects you, judging by your comments.
Please do not judge the faith alone by standards of a vocal activists of an organized church/religion, same as do not fall into the trap of believing that any experiment could be called "science" even if it's fabricated for a different purpose than pursuit of truth or expansion of knowledge.