“There are lies, damned lies, and statistics”-—Mark Twain
Now, I don’t know if polls are a type of “statistic”, but I do believe that the premise offered here that the “Catholic” vote offered in poll results are not accurate for the very reason that others here have given—that there are practicing Catholics and then there are those who call themselves Catholic when actually they are not.
For that reason, I don’t believe the poll results are factually accurate.
Ignore what you wish when it comes to political knowledge.
The rest of the political world wants to know how the different demographics vote and at some point Republicans are going to have to look into why they do well with Protestant Hispanics and do terribly with Catholic Hispanics for instance.
Some bolder (conservative) Catholics must be interested in the Catholic voters and studying their historical voting pattern for democrats.