Final answer:
Presidents of the United States have not all been Protestants.
Step-by-step explanation:
False
All presidents, with one exception, have not been Protestants. There have been non-Protestant presidents throughout history. For example, John F. Kennedy was a Roman Catholic, and Joe Biden is also a Catholic. Additionally, Thomas Jefferson was a Deist, which is a non-Christian belief system.
Learn more about Religion and the presidency