Is the Church of Jesus Christ of Latter-Day Saints a Protestant Sect?

[True Federalist (진정한 연방 주의자)]

No. My definition of Protestantism includes that it is a non-Catholic Trinitarianism, and Mormon theology is not Trinitarian.  So while Mormons are Christian, they are not Protestant. Additionally, because of their belief in continuing revelation thru modern-day leaders, they lack the essential Protestant tenet of sola scriptura, even if one accepts the Book of Mormon as scripture.

[True Federalist (진정한 연방 주의자)]

A Christian is one who follows the teachings of Jesus and believes him the Savior, with that in our name, it's a silly argument not to call us Christians.

Agreed, but the question being asked here isn't whether you are Christian, but are you Protestant, and for the reasons I gave earlier, I wouldn't call Mormons Protestants.

[True Federalist (진정한 연방 주의자)]

No, they don't hold common Protestant theologies, nor do they share a common Protestant history. If they're Christians, they're their own branch.

well, the LDS movement unquestionably grew out of the equally-unquestionably protestant Second Great Awakening.  to that extent it is very much a child of a uniquely American protestantism.

Yeah, but if by that logic Mormons are Protestants, Protestants are Catholics.

[True Federalist (진정한 연방 주의자)]

I was responding to the implication that we might not be Christians, why would the OP put "let's assume" if there were no doubts?

Because while there are those who doubt, those doubts weren't what the OP was interested in exploring.

[True Federalist (진정한 연방 주의자)]

Heck, if Bishop Spong was a Protestant, how aren't the Mormons?

Spong deviates enough from Episcopalian orthodoxy that it is questionable that he should still be considered Protestant, tho the church he officially belongs to certainly is.