Divergence from traditional Christian beliefs is a continuum. God is the ultimate judge. When we label, we divide.
Yes, Mormonism is way out on that continuum. But some individuals are much closer. Who, exactly, we don’t know, because some have a tendency to lie.
Oneness Pentecostals are much closer, except they are generally very anti-Catholic. So, technically, they are not Christian. As individuals, some are much closer.