I'm old enough to remember JFK, but was not old enough to vote at the time. Perhaps in part because I was raised in a Roman Catholic family, I do remember that his Roman Catholicism was an issue in the 1960 election. Some people were worried a Roman Catholic President would be loyal to the Pope, and not the Constitution, and that was the issue. That seems silly now.
"I am not the Catholic candidate for President. I am the Democratic Party's candidate for President, who happens also to be a Catholic."
I honestly could not tell you which denomination any of the Presidents have belonged to, other then Kennedy.
I mostly just know because the plurality of them have been Episcopalian, which is the church I was raised in, although I don't identify as such any more.