MormonISM is the LDS belief system.
Mormons are individuals that follow that particular belief system.
When anti-Mormon is stated, it is usually understood that it means anti individual Mormons.
In other words, dislikes Mormons because they are Mormons.
When anti-MormonISM is stated, it is usually clear that it is anti the LDS belief system.
All main stream Christian denominations declare that the LDS belief system is not a part of main stream Christianity because of the many extra-Biblical beliefs that are propagated by the LDS prophets of old and recent.
For instance, that the Book of Mormon is the gospel truth, while the Bible is only accurate when “properly translated”
Which give the opportunity to deny certain Biblical truths.
Much more can be learned by visiting the Religion Forum here at Free Republic.
Take it up with Joseph Smith, or God if you ever see him. Romney loves Jesus Christ and acknowledges him as his Lord and Savior, and that’s all you, as a Christian, need to know.