DES MOINES, Iowa — Republican presidential candidate Mike Huckabee, a Southern Baptist preacher, declined Tuesday to say what he thinks of Mormonism, the religion of rival GOP candidate Mitt Romney.

"I'm just not going to go off into evaluating other people's doctrines and faiths. I think that is absolutely not a role for a president," the former Arkansas governor said.

While he said he respects "anybody who practices his faith," Huckabee said what other people believe — he named Republican rivals Romney, John McCain, Rudy Giuliani and Democratic front-runner Hillary Rodham Clinton — "is theirs to explain, not mine, and I'm not going to."

Also on Tuesday, Huckabee bristled when asked if creationism should be taught in public schools.

Huckabee — who raised his hand at a debate last May when asked which candidates disbelieved the theory of evolution — asked this time why there is such a fascination with his beliefs.

"I believe God created the heavens and the Earth," he said at a news conference with Iowa pastors who murmured, "Amen."

But he expressed frustration that he is asked about it so often, arguing with the questioner that it ultimately doesn't matter what his personal views are, saying, " ... what I believe is not what's going to be taught in 50 different states."

The former Arkansas governor pointed out he has advocated for broad public school course lists that include the creative arts and math and science. Why, then, he asked, is evolution such a fascination?

In fact, religion seems to be more of an issue in the GOP Iowa caucuses with one month left before the voting.

In recent weeks, Huckabee has moved from the back of the pack in the state to challenge longtime leader Romney, who would be the first Mormon president. The race is now a dead heat, with the Iowa caucuses — the first contest in the nomination fight — set for Jan. 3. Christian evangelicals, by many estimates, make up anywhere from 30 percent to 50 percent of Republicans who will attend the caucuses.

Huckabee has consolidated the support of influential religious conservatives, primarily by reaching out to a network of pastors across the state. He spoke privately Monday night to several hundred gathered in Des Moines for a conference, the only presidential candidate to do so.

He appeared with more than 60 Iowa pastors endorsing him at a news conference Tuesday, including best-selling author Tim LaHaye of "Left Behind" fame and his wife, Beverly. Also endorsing him was Chuck Hurley, an influential Iowa conservative who had backed Kansas Sen. Sam Brownback, a conservative who quit the race in October.