WorldNetDaily has an interesting article showing how all 50 states include a reference to God in their consitutions

California 1879, Preamble. We, the People of the State of California, grateful to Almighty God for our freedom …

Tennessee 1796, Art. XI.III. That all men have a natural and indefeasible right to worship Almighty God according to the dictates of their conscience …

That does do something for the argument that the Founding Fathers had no intention of a God-less state…