Mormon beliefs are certainly decidedly more wacko that most, but they still technically fall under the technical definition of Christian - a believer in Jesus Christ. As you noted, even baptism seems optional to some, and that seemed to me to be an absolute minimum requirement according to scripture.
But that’s what you get when you have such a vague qualification. A bunch of wackos who can technically be considered Christian because they fulfill the basic requirement. They might have added tons of embellishments that you don’t agree with or omitted things that you consider necessary, but in the end…they’re still Christians.
Really, isn’t its ready accessibility the real beauty of Christianity?