The 11th to 12th century is very late into the Middle Ages.
Well, I don't remember a precise exemple but I'm not knowledgable enough on religion in Medieval Italy to be definitive on this.
That said, what I managed to understand from the period, would surprise me more than a bit (but that's okay, I love being surprised) if it was something really much more pagan than the usual mix of Christianity and folk practices you could found either in peripherical regions, or more or less munched in more important places.
What did you have in mind?
Local paganism persisted in its old forms for centuries after Rome.
This is the problem with the concept of paganism : it's used to describe a lot of different realities, mixing both the urban/institutionally supported beliefs and practices, what existed in rural part of provinces, and what survived out of both in an increasingly Christianized society.
The point you seemed to do, tough, was that the same kind of cults that existed in the Late Antiquity (Isis, Mithra, etc.) was continued well in the Middle-Ages in remote places where they probably didn't existed as such before Christianisation.
When medieval chroniclers speak about Diane in their description of contemporary heterodoxy;when German penence books mentioned the worship of Mercury, when they mention Apollo as a deity worshipped by Muslims, they definitely not describe a religious reality, but borrow heavily on classical and early christian authors to explain a non-Christian or a para-Christian (the distinction between Christian heresy, and pagan worshipper is sometimes hard to tell for some authors) reality they couldn't concieve differently.
Even the focus given on dance and songs by Christians can be traced rather trough a Biblical narrative (as Hebrews danced and singed around the golden calf) than due to a specific threat of such.
It doesn't mean that you didn't have pagan survival in one form or another (altough folkoric and semi-hidden forms would be probably more current), but that what we know about it are from sources that not only didn't really grasped the reality of it, but had no real interest doing so.
If anything, Christian chroniclers were keen to downplay it and emphasise their victory.
You had a lot of narrative convention to treat definitely heterodox practices as the survival of something bigger, to highplay the role of missions.
The whole martyrology and mission hagiographies in Northern Europe, for instance, really fits these while we know the actual christianisation went much more smoother.
Again, not to say you didn't have a genuine survivance of names or practices, but these doesn't make it the same ancient practices as much early Christianity wasn't the same than medieval Christianity. Especially when descriptions we get are made by people that had to anachronically minequote their main sources on paganism : Bible and classical authors.