" Doesn't matter. If a word in the Constitution has a plain meaning, there is no need to look at original intent."
Thats precisely what I have been saying, if the founding fathers wanted to say Christian denominations they would have said just that. Intelligent men like the founding fathers wouldn't leave important words in a constitution (or any other important legal document) so ambiguous, it quite literally means what it says and says what it means.
It doesn't make sense to just ignore the historical context of teh Constitution.