>>They use the Bible, and believe they get salvation through accepting Christ’s sacrifice on the Cross. <<
Two things. First, lots of non-Christian sects use the bible. Second, Christians believe that the blood of Christ is a complete atonement for their sins. We call it Grace. Mormons believe it is a partnership. Jesus did part and you do part. I’m WAY oversimplifying, but there are plenty of people here that will be happy to spam you on the subject. ;)
In all seriousness, Mormonism has much more in common with Islam than it does Christianity.
Mormonism denies the cornerstone/capstone of Christianity.
Some of their beliefs are pretty nutty to me,, but they do make good neighbors.