This is interesting. Why do you think this is polytheism? I've always enjoyed reading your responses in the past to things like this -- it would be a real loss for everyone if you've decided to shrink your audience to fellow Calvinists. That would make me sad.
The cult of the saints is a functional pantheon, consisting in patron deities. And to judge by this report, many Italian Catholics pray to saints before they pray to Jesus.
Thomas Fleming once said that neopagans should join him in the RCC because Rome has more saints than they have gods.
To be fair the questionaire asked what saints they prayed to as opposed to who they prayed to .