Sounds like an urban legend. Do you have any stats to back it up, or are you simply going on "a friend of a friend said that..?"
If you're looking for references, you might consider starting with James R. Lewis' "Satanism Today", which includes a 1992 FBI study on ritual abuse (satanic-based), and if you want more numbers, statistics and patterns you might consult Tony Kail's "Cop's Guide to Occult Investigations: Understanding Satanism, Santeria, Wicca, and Other Alternative Religions".
There may be lots of urban legends out there, but the increase in occult-based crimes is not one of them.
Hope those references help you out there Junior.