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It would be incorrect to state that “most” Christians do not view Mormonism as a Christian religion. A 2007 survey by the Pew Research Center reported that a majority of Catholics (52%) say that Mormons are Christian; 29% say they are not. Among all Protestants, more say Mormonism is a Christian religion than say it is not by a 49%-to-34% margin. This includes 62% of white mainline Protestants who say Mormons are Christians.
Of the major Christian groups, white evangelical Protestants are the most likely to say Mormonism is not a Christian religion: 45% say Mormons are not Christians, while 40% say they are Christians.
While many Christians see Mormonism as a Christian religion, most Christians do not see their faith having much in common with Mormonism. Among all non-Mormon Americans who express a religious preference (most of whom are Christians themselves), fully 62% say that Mormonism and their own religion are “very different.” This opinion is held by 67% of white evangelical Protestants, 61% of white non-Hispanic Catholics and 56% of white mainline Protestants.
For more details about public attitudes toward Mormons, see these reports and commentaries from the 2007 survey:
“Public Expresses Mixed Views of Islam, Mormonism,” Sept. 25, 2007
“Clinton and Giuliani Seen as Not Highly Religious; Romney’s Religion Raises Concerns,” Sept. 6, 2007
“Public Opinion About Mormons,” Dec. 4, 2007