Hmmm... likely they say that so people like you will feel more comfortable voting for people like Romney.
I'll continue to say that because of the other requirements to reach the Celestial Heaven which you cannot reach just through this belief, and their belief that I as a non-believer will also be in heaven, just not their central heaven those who follow the other steps towards the Celestial Heaven reach, that saying this belief is a requirement as it is in Christianity to reach paradise would be incorrect and entirely different than that of Christianity. Their beliefs are equidistant from the mainstream Christian as Christianity is to Judaism. It's like saying Christians are Jews because they all believe in Yahweh.
While they may believe that because of Grace we all get there, it isn't a belief in this Grace that will get you there like in Christianity.
Basically, they believe that the mainstream Christian will go to heaven like the Buddhist, but will never reach the Celestial Heaven without the other steps necessary to reach that... You do not follow the teachings of their church and are not a Priest of Malchezidek, don't believe in the Prophet (current President of the church), do not know the pass and token of the pass to get in. You are not going.