In just one example of the practices that set Mormons apart, LDS church founder Joseph Smith revised � and in his view corrected — parts of the Bible.

Brown said it was "nonsense" to consider questions about Romney's faith simply a dialogue about religion. Mormons were especially outraged when GOP presidential contender Mike Huckabee, a Southern Baptist pastor, asked whether Mormons consider Jesus and the devil brothers. Latter-day Saints say Huckabee's question is usually raised by those who wish to smear the Mormon faith rather than clarify doctrine.

"If you're making a decision about whether or not to vote for someone because of their religion, you're flirting with bigotry," said Brown. He monitored the commentary on his blog Article VI, named for the constitutional provision barring any religious test for public office.

Richard Mouw, president of Fuller Theological Seminary, a prominent evangelical school in Pasadena, Calif., said some Christian conservatives consider Mormonism not just a questionable faith, but also a rival political force. He lived in Michigan in the 1960s, when Romney's father, George, was governor there. At that time, evangelicals weren't deeply involved in politics. Many supported George Romney.

"What's going on when his son runs and all of a sudden there's this overt hostility that came out, which did not come out toward his father," said Mouw, who is part of a group of evangelical and Mormon scholars who meet to discuss their theological disagreements. "I'm kind of ashamed of the way that a lot of traditional Christians have handled this."

Yet, Mormons say some good has come from the attacks. Romney's candidacy pulled the church even further into the public square.

Mormon leaders posted videos on YouTube explaining their faith. A church elder, recently speaking to Mormon college students, urged young people to post about the Latter-day Saints on blogs — a major move for a denomination with a history of quietly answering its outside critics. After Romney's Dec. 6 speech in Texas defending his faith, a Mormon leader went on al-Jazeera television, the Quatar-based network, to discuss the church.

"Gov. Romney has, perhaps without intending to do so, rendered the church a service," said Robert Millet, a scholar of the church and professor at the LDS-owned Brigham Young University. "It's served as a kind of wakeup call for Saints themselves to the fact that we're not as well understood as we think we are. How can it be the case that Gov. Romney and his feelings about Christ and his feelings about religion have been so little understood?"