As a Catholic cleric who grew up in Utah, and have studied their faith extensively; I will not change how I refer to their church.
The current President has this preference, and that is what is behind it. All previous Presidents of their church were happy to be called “Mormons.”
One of their extra-biblical scriptures is named after a prophet called “Mormon.” This figure was a prophet, and also a sort of church historian who compiled what is in that book. They could just as easily been called “Pearl of Great Pricers,” or “Doctrine and Convenanters,” which are other parts of their fabricated scriptures.
Most Mormons are fine calling themselves Mormons, or “Latter Day Saints,” or “LDS” or even just short-hand “saints.”
All of these things are PR / Marketing / shaping / forming tools to alter the way people view their cult. Yes, Mormonism is a cult.
The Church, of course refers to the
Catholic Church (or the unified Church before the schism). Mormonism is polytheistic and denies the Trinity. They fail the first test of a Christian church, so they cannot properly be called one.
Their baptisms are invalid, and converts coming from Mormonism into the Church are baptized.
The true Church bears the four marks of being: one, holy, catholic, and apostolic. Protestant churches were part of the true Church at one time; Mormonism is an American-made, preposterous, amalgamation of freemasonry and parts of churches from the Adventism branch of Protestantism, mixed with fanciful legends. It should be called
Joseph Smithism, because that is what it truly is.
So no, I won’t be changing how I refer to Mormonism or individual adherents thereof.
PS: Mormons have no problem referring to those who are not Mormon as “Gentiles,” this includes Jews.