We live under a non-secular constitution. Do you really believe that God will come to our rescue to enforce it if we allow the state to ignore it?
Oh yes. If the majority of the people in this nation turn away from God, the nation will lose His blessing and become weak - or worse, the government will implode.
If the state offends God in its treatment of one of His children, He will intervene - not necessarily in the way you would expect, but He never abandons His children.
This was the reasoning that was used in the Islamic world in response to the Mongol invasions. There was a turn towards fundamentalism whose evil effects are still with us.