They don't deny the divinity of Jesus. It's more that they have a neo-Arian view of the trinity that the godhead is one in purpose but separate in form, and Jesus is the literal son of God the father (they do NOT game out the repercussions of this in a coherent or sophisticated way, but it's what they believe). Theologically, they're sort of polytheists, but the death and resurrection of Jesus of Nazareth is an essential part of their belief system. So, it really comes down to whether you're willing to allow certain belief structures rejected by the Council of Nicaea to continue to call themselves Christian, or at least to nod politely at their self-identification, or whether you make academic theology the hill you will die on in terms of culturally significant labels adopted by ostensibly areligious bureaucracies. It sounds counter-intuitive, but there's more than one way to define a Christian.
The Mormons are absolutely reaping what they sowed by throwing in with MAGA, though, and you know the Romneys and Huntsmans are snickering somewhere with a glass of wine, which they can have because they did double-secret off-the-books Temple shit.
Tommy Tuberville would like a word...