Oh, I have no doubt. But that's most likely (I say as if I knew any of these people you're referring to) a case of latching on to rumors about D&D that have been floating around for years.
See, for my parents (and for my wife, for that matter) the potential problem with D&D isn't that it's evil, its that its potentially a time trap where I spend too much time and energy while neglecting more important things. Which, all things considered, is probably more a reflection on me than on D&D. Plus my wife thinks it seems pretty nerdy to tell her friends that I'm off playing D&D. Then again, my current group got it's start at church; my wife overheard two other members of our ward that we didn't really know well talking about D&D, and jumped in and said, "hey! my husband plays that too!" At one point, there were eight of us all from the same congregation playing D&D regularly. Sadly, due to move-outs and people getting into other hobbies, there's only three of us left that still do.
My dad was also pretty savvy, and ran the Special Collections Department at the Cushing Library of Texas A&M University--which has one of the premier science fiction and fantasy collections in the nation, I might add, so he knew a thing or two about it. He may have been aware of the various topless monsters and whatnot in some of the early books too. That's a more valid concern for Christian groups than "D&D = Occult and Satanic", IMO. Then again, those are versions of the game that have been out of print for some time, too.