Then they are not Mormons. You will also find that the teaching, doctrine, and curriculum of the LDS Church is extremely standardized - moreso than any other church. The same lesson is taught on the same Sunday in every Sunday School in every LDS Meetinghouse around the world. This year we studied The New Testament in Sunday School - in every Gospel Doctrine Sunday School class around the world. We used the same manual, the same scripture references, etc. If there are any Mormons running around not knowing what they believe or saying they don't believe in certain things the Church has taught, then they should make an appointment with their Bishop to get things straightened out or to have their records removed.
I disagree. I know plenty of Mormons that are faithful but don't necessarily follow all the teachings of the church. They may not be "good Mormons" but then I'm probably not a "good Methodist" either.