Very, very dangerous territory this. We need to be aware of two dangerous trends: Christian dominionism and Christofascism, both of which are heretical and play into the right wing, conservative camp. There is no such thing as "Christian government" - it is a very insidious construct and we seem to have already forgotten that the Apartheid regime considered itself Christian. It's religion was a heretical calvinism: it had all the trappings of the Christian religion but was rotten to the core. Let us not make the same mistake again. Where the kingdom of God attempts to play the role of the kingdom of Caesar, The kingdom of Caesar always devours the former.
In addition, there is the assumption that Christianity trumps all the other faiths in the land: Islam, Judaism, Hinduism, African religions. This is an arrogance which flies in the face of multiculturalism and religious tolerance.