[sittnick]

Which presidents were Unitarian? Unitarian Presidents
John Adams
John Quincy Adams
Millard Fillmore
William Howard Taft

complete list of religious denominations of presidents

Interestingly, Eisenhower's parents were pretty serious Jehovah's Witnesses. I think it is safe to say that he stopped believing Russelism by the time he was Prez (for starters., they don't get involved in politics). He DID use a "New World Translation" Bible for the second inaugural, however.

[Delphinium]

“We recognize no Sovereign but God, and no King but Jesus!” [April 18, 1775, on the eve of the Revolutionary War after a British major ordered John Adams, John Hancock, and those with them to disperse in “the name of George the Sovereign King of England." ]John Adams.

this does not sound Unitarian to me, course Methodists were quite different back then too.