How many people in the US are Christian?
About 15% of people in the U.S.
As with most English people (which originally created the US) the religion of the US in 1785 ,as it now, is predominatly Protestant Christian. I am not sure if it was made the state religion. This may sound weird for many Americans in the South-West USA (like California and Texas) because most people there are Catholic Christian (because of the Latin American Heritage majority).