Really the current state religion in the USA (and really the entire Western world) of the public schools and Government is that of atheistic naturalism.
Almost all Americans have heard the phrase “separation of church and state.” However, fewer realize the phrase is not in the Constitution. Yet, it has been used as something of a club to “beat down” and eliminate Christianity from public places, including symbols (like crosses), Bible reading and prayer in public schools, and the teaching of creation in science classes.
Now, where does the phrase “separation of church and state” come from? It is not a part of the original U.S. Constitution of 1787, as most people falsely believe, or in any of its amendments. In reality, the idea of a “wall of separation” between church and state came from a private letter from President Thomas Jefferson, and it has sadly been misused to slowly, but surely, eliminate Christianity from the public sector—and replace it with an anti-God religion.