The results are disputed between polls, but it appears that Catholics have only voted Republican for certain, 3 times, those were to reelect Nixon in 1972, to elect Reagan in 1980, and to reelect Reagan in 1984.
Disputed polling has National Election studies claiming Catholics voted to reelect Eisenhower in 1956, but Gallup says they voted for the Democrat, Gallup and National election studies says they voted Democrat in 1988, but media exit polls say they voted for Reagan’s veep, HW Bush, and we get that exact same break downfor George W’s reelection in 2004.
Other than those they have always voted Democrat.
Protestants have always voted Republican going back to around the early 1900s (that is as far as I can find good polls) with three exceptions, 1932, 1936, and 1964.
Pray tell, on what basis is that "appearence" predicated if the polls you refer to are in dispute.
Furthermore, how was the data aggregated with respect to black protestants?
Not southern white Protestants, who were solidly Democrat until the 1960's.
Not black Protestants, who've been solidly Democrat since about the same time.
Golly, maybe that means -- get this! -- people change their political allegiances over time and maybe in the future we'll have a solidly Republican Catholic majority.
But maybe you'd rather not see that.