Shooting holes in the claim that separation of church & state is a myth

Over at Talk To Action, a very brave and knowledgeable fellow who calls himself Mainstream Baptist is taking on David Barton, vice chair of the Texas Republican Party. Apparently, Barton likes to claim that the constitutional principle of the separation of church and state is a myth. Mainstream Baptist does a good job of providing resources to show that while the separation of church and state is firmly rooted in American history, the idea that this is a Christian nation is the real myth.