In the early 1970's when I became a Christian, my mormon bishop friend told me "No WE ARE NOT Christians. . .We ARE MORMONS instead."
They do NOT RESEMBLE historical Christianity
they serve different gods
they have different leadership
they have different goals
they follow a 'new guy on the block' who INVENTED a bunch of dung.
So WHY would they consider themselves any more "Christian" than the other 'lds' groups (about 150 or so of them)? THEY TOO follow 'a' 'christ' just like the mormons do.
So WHY THE CHANGE in mormonism?