What's Shrub doing "leading US in day of prayer"?

It strikes me as very odd that the president of the USA, a country that likes the world to think it has a separation of Church and State, would "lead the nation in a day of prayer". It's a bit Ayatollah for my liking.

Was the USA founded on Christianity? This article makes it seem even more weird, especially to someone not living in the USA. (For the record, I live in God's Own Country, the Greatest Nation on Earth, Land of the Free, Home of the Brave, land of the Stars and Stripes flag, blah blah blah yackety yack ... Australia, of course.)

Tagged: dubya, bush, jesus, christ, christianity, usa, america, church, prayer