Most voters don't care very much about Romney's Mormonism.

A survey this summer by the Pew Research Center and the Pew Forum on Religion and Public Life found that 60 percent of voters who know of Romney's Mormonism are comfortable with his religion. Another 21 percent said it doesn't matter.

But the Pew survey also found that, along with atheists and agnostics, white evangelicals and black Protestants are the most uncomfortable with his religion. The vast majority of those who are already Republican will vote for Romney anyway, but only 21 percent of those who are uncomfortable with his Mormonism will back him strongly. Some may choose not to vote at all.

This could spell trouble for Republicans. CBS News found that half of the voters in the 14 GOP primaries from January through March were evangelicals. Their lukewarm support for John McCain in 2008—with many staying home on Election Day and around 30 percent of their 18-29 year-olds casting votes for Obama—helped give the White House to the Democrats.

The Pew survey found evangelicals evenly split on whether Mormonism is a Christian religion. Of those evangelicals who say Mormonism is not Christian, some fear it will advance Mormonism and blur the boundaries between true Christian faith and its counterfeits. They think this election will force them to choose between the nation and the gospel.

But are these evangelicals right to think that Mormonism is not Christian?

They are right to think that the God of Latter-Day Saints (LDS) is different from the God of traditional Christian orthodoxy, but evangelicals have often been wrong in their reasons for believing this.

For example, they have sometimes thought Mormons deny the divinity ...

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