I have relatives like that. Fortunately, they are still practicing Conservatives.
I think the only accurate statistic for Catholic voting practices is if the pollster controls for churchgoing v. non-churchgoing.
You'll have to be more specific in those two categories. Bear in mind, our church attendance triples on Christmas and Easter. The ChrEasters no doubt consider themselves to be "churchgoing".
Otherwise you can just go in and wander around looking at the stations of the cross, the pictures, the statuary, etc.
Maybe it's more than ten times the number ~ BTW, former Catholics who belonged to the same churches I have actually had better attendance than lifelong hereditary Protestants.
I guess if you gotta' go look for something it means a whole lot more.