Snobbery and Christianity

John McCain's sudden decision to call himself a Baptist (everyone thought he was an Episcopalian) has reverberated a little in the South:

I don't care whether Republican presidential candidate John McCain is an Episcopalian or a Baptist.

But the implication in Monday's paper that he'd been caught at something outed while trying to pass as an Episcopalian hit a nerve.

Why do we diss Baptists?