I cannot think of one good reason for state-sponsored expressions of piety. A religion that believes it needs the help of the state has lost its faith. The early Christian Church thrived when persecuted, but fell into disrepute in its exercise of temporal power. I have never heard of anyone being saved (under any interpretation of that word) by the rote repetition of "under God" at a public assembly. Moreover, I do not want anyone to hate my religion, or religion in general, because the state shoved it down his or her throat. History is full of examples of politicians using religion to justify slavery, war and discrimination, all to the detriment of the faith. I see no harm in keeping the state absolutely separate from the church and great dangers in mixing the two.