Well, since the SCOTUS has deemed it perfectly proper to cite the private correspondence of a POTUS to a Baptist minister in Danbury, CT as legal precedent, there is a simple solution to the matter.
President Bush can simply write a letter to a current Baptist minister in Danbury, Ct letting him know that displaying the Ten Commandments, praying before football games, voluntary rectitation of the Pledge with the words "under God" and voluntary prayer in public institutions are indeed Constitutional.
Voila!