We had a maypole in Catholic school when I was growing up. We were well aware of the pagan roots of many Catholic practices, and didn't mind that at all. Fundamentalist Christians, of course, have a different attitude - and some condemn Catholics for their laxity on this. I don't know that maypoles are so much being condemned by Christians as a pagan custom, as they are being reclaimed by modern pagans as part of their tradition.

See The May-Pole of Merry Mount, by Nathaniel Hawthorne.

-Joe-