@cicerone imposter,
I believe Catholics would take issue with your first statement. They most definitely believe in Christ as their savior.
The LDS faith differentiates itself from all others in several key areas, most notably in its belief in God's special relationship with the U.S.A. and Jesus' physical, living appearance in this country. Among other doctrines, they believe the U.S. Constitution is divinely inspired.
According to Wikipedia ("Mormonism"), "In many ways, however, the religion differs from orthodoxy as held by Catholic, Orthodox, and Protestant Christianity. To those for whom Christianity is defined by that orthodoxy, Mormonism's differences place it outside the umbrella of Christianity altogether."
I am a member of a mainline Protestant denomination. Some in my church consider LDS to be Christian, some don't. I could argue it either way, but my opinion isn't important at all. What the LDS church believes about itself is. From the same article quoted above, "Mormonism classifies itself within Christianity, but as a distinct restored dispensation (a period of time...)" So, they do not consider themselves to be Catholic, Orthodox or Protestant. They see themselves as being in a unique position.