Not even close. Obama won by 2.5 million votes. There would have had to be over 125 million voting Catholics for it to have made a difference. That is more than the total number of votes cast. The actual number of Catholic voters was probably less than 25 million.
Depends on the states they’re in. If enough Catholics in certain states didn’t vote dem, it could very well have swung the election because of the electoral college.
NYS comes to mind, with it’s HUGE Catholic population.
Nice try, but that boat don’t float.