Maybe it is because one of them (his personal faith issues notwithstanding) has good Christian values in his life and the other opposes anything Christian or Jewish (or American). It is so we can choose.
As for Carter, please see Luke 13:22-27.
Something that you aren't aware of, is that Bishop Romney, a devoted, devout, powerful, Mormon leader, is not merely not Christian, but has devoted his life and 10s of millions of his personal dollars, to defeating Christianity.
Mormonism was created as a ANTI-CHRISTIAN cult, it exists to defeat Christianity, nothing is more anti-Christian than Mormonism, it is why it wears the look alike appearance, uses the words Jesus, and Christ, it is why they will use the bible and lies to seduce you, and then replace the bible with the book of Mormon and explain to you that you to, can become God, that Jesus and Satan are brothers, that God used to be just like you, a man, and that you can become just like him, a God.
A Muslim holds a sword up to me and says convert or die a Christian, a Mormon holds up the bible to me and says, let me explain this to you, and make you a God.