There is a great quote from Joseph Campbell in one of his interviews with Bill Moyers, where Bill Moyers says, "Do you have faith?" And Joseph Campbell says, "I don’t need faith. I have experience." And for me, working with the tarot on my own and with other people and seeing how meaningful the interpretations of the cards are, I have to think that the symbols are just too strong to ignore.
(Thanks to Paul for pointing out the Campbell nugget.)