There is no such thing as “nominally Christian” kinda like you are either pregnant or you are not. Mormonism isn’t any more Christian than Islam. Both use different poisons, but the same death will result.
Luke 11:23
23”He who is not with Me is against Me; and he who does not gather with Me, scatters.
I’m a nominal Christian and if you don’t like or believe I can be such that’s your problem. Not mine.