Yes God is a big part of how this country was formed. It is a shame that some have forgotten this point. It is "seperation of church of state" and not "seperation from church and state". Religion has always been a part of this great country since the beginning. Everyone has the right to practice whatever belief they have, our country will just never be ruled by one religion.

http://en.wikipedia.org/wiki/Separation_of_church_and_state_in_the_United_States 

http://wilstar.com/holidays/wash_thanks.html