Non-Protestant US Presidents

Name the five US presidents who did not officially affiliate themselves with the Protestant branch of Christianity.
Two of the presidents without a religious affiliation did not publicly identify as Christian; the other did but not as a member of any specific denomination
For the sake of this quiz, Unitarians and Quakers are considered Protestant
Source: Wikipedia
Quiz by modi
Last updated: April 5, 2021
First submittedApril 9, 2019
Times taken612
Average score80.0%
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Roman Catholic
John F. Kennedy
Roman Catholic
Joe Biden
(none specified)
Thomas Jefferson
(none specified)
Abraham Lincoln
(none specified)
Andrew Johnson
Level 76
Dec 7, 2020
Joe Biden is set to become the second Roman Catholic president.
Level 68
Dec 10, 2020
Yep, I'll update after the inauguration!
Level 67
Apr 5, 2021
Is there a set standard for Protestantism, or is it just any Christian faith that is not Catholic?
Level 84
Apr 5, 2021
Christian sects that grew out of the Protestant Reformation are usually counted as Protestant. This does not include, for example, Eastern/Greek/Russian/Armenian/Ethiopian Orthodox, Lebanese Maronites, Egyptian Copts, etc... nor does it generally include Mormons, Quakers, Jehovah's Witnesses, Branch Davidians, Christian Scientists, the Moonies, Heaven's Gate cultists, or Muslims, etc, all of which are off-shoots of Christianity. Many Christian religious traditions which are not Catholic, particularly in Western Europe and North America, which began long after the Reformation of the 16th Century but nonetheless adhere pretty closely to Protestant beliefs, might be considered Protestant. But it's really all pretty arbitrary as religious belief and practice is constantly evolving and who's to say what constitutes a cult or new religion and what is simply a new church or custom within an existing religious framework...
Level 84
Apr 5, 2021
... but for sure some non-Catholic Christians like the Armenian Orthodox church predates Martin Luther and Protestantism by centuries, and thus it would be very odd to call them Protestants.
Level 66
Apr 5, 2021
Wow, that was a very good and detailed answer!
Level 70
Apr 5, 2021
Kinda building off what Kal said, I feel like Hoover and Nixon should be added since they were both Quakers. And for Jefferson, you might want to say "Deist"--I know it's not a Christian denomination, but it's the most accurate word to describe his beliefs.

(On an interesting side note, Jefferson made a unique version of the Bible where he cut out references to Jesus's divinity or miracles. If you want to read more about it, check this out.)

Level 67
Apr 6, 2021
Thanks, all. Yes, the impetus for my question was that I know Nixon was a Quaker, which I do not really think of as a Protestant denomination. I was surprised he was not listed among the answers.
Level 73
Apr 5, 2021
You should probably shorten the time a bit, I was able to type every president. Not by a lot, but maybe by like a minute