living in utah, i know many LDS folk as well and i'm pretty familiar with their faith. i can understand why their cosmology causes some mainline christians to hold them apart, but i can see no basis for your saying that they do not preach salvation only through chirst. why do you say that?
I may be wrong here, but it seems to me that the person of Christ has a different relationship with both sinner and the Father than in "mainstream" Christian denominations.