True, the Constitution does use the exact words "separation of church and state" but that's also irrelevant to the easy conclusion that the concept was embodied in the document. For more than you may want to know on this, take a look at the following:
http://members.tripod.com/~candst/tnppage/tnpidx.htm
http://members.tripod.com/~candst/
The problem with fundamentalists like Bush is that their actions are motivated by a belief system which represents the benchmark for religious intolerance...those who don't accept the Christian Creed as announced by Paul are wrong and are condemned to an eternity in hell...end of story. Bush's comment that his faith is manifested in his decisions as our president simply points out that he sees world and national issues similarly, in black and white. Like lots of personality traits, this one is a double edged sword...it's both his greatest strength and his greatest weakness. He has the single mindedness of conviction, but is unable to distinguish easily, if at all, the difference between conviction and instead only being decisively wrong. Kerry obviously isn't afraid to reevaluate a position taken...witness serving voluntarily in Nam and then opposing the war after coming home. However, he lacks Bush's unwaivering determination, and it's not all bad for our president to be as commited as are the terrorists.
I can accept either Bush or Kerry as president. The damage either of them can do is relatively limited, thanks to another enlightened concept of our founding fathers--separation of powers.