By Eric Marrapodi, CNN Belief Blog Co-Editor

(CNN)– Kirk Cameron could have joined the ranks of former TV heartthrobs who rode off into the sunset, reappearing only for the occasional reunion show or career-reviving role in a TV drama. Think Ricky Schroder or Scott Baio.

But Cameron, known to millions of Americans as Mike Seaver on the hit ‘80s-era show “Growing Pains,” is carving out a new niche for himself, as an unlikely voice of politically conservative American evangelicals.

Cameron has a new documentary on the faith of America’s founders that arrives in theaters on Friday. He is neither a historian nor theologian, but the film, “Monumental,” shows him consumed with Christianity - and with rage over what he says has been the systematic removal of religion’s role from American history.

The film opens with Cameron sitting on an Adirondack chair in his backyard. Looking straight and silently into the camera, a voice-over of his own voice alerts viewers that the world around him is going to hell.

“There is something seriously sick in the soul of our country,” the voice-over says.

“Don’t worry about the fact the world is going to hell in a hand basket - just get out of the hand basket,” his friends tell him. But Cameron explains that he refuses to listen and instead sets out to make “Monumental: In Search of America’s National Treasure,” which investigates the debate over America’s soul.

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Over the last decade, Cameron has become the wholesome, boyish face of Christian cinema. He starred in “Left Behind,” the low-budget film based on the wildly popular Christian book series.

More recently, he played the lead role in “Fireproof,” a breakout film that shocked the Hollywood establishment when it debuted in the top 10 in its first week and wound up taking in an estimated $33 million. The film was made by Sherwood Baptist Church in Albany, Georgia, for just over $500,000.

Cameron was one of the only professional actors in the film; the rest were congregants from the church.

Along with such popular movies as Mel Gibson’s “The Passion of the Christ,” ”Fireproof” showed the potential for a new market in explicitly Christian films. In the last two years, crossover movies like “Soul Surfer” and “Courageous” have had parallel advertising campaigns targeting churches.

The movement has propelled Cameron back into the spotlight.

“Monumental” is Cameron’s baby. He is its executive producer and its star.

“When I survey the landscape and turn on the news, all signs are saying panic,” Cameron recently said.

“Instead of listening to everyone play the blame game … maybe the best place to look for solutions was to talk to the men and women who built this country 400 years ago and laid the foundations that resulted in a nation that has experienced more blessing and prosperity and strength than any other nation in the world,” he said.

“That launched me on this journey to retrace the Pilgrims and find the sacred sauce.”

In the film, Cameron retraces the Pilgrims’ steps from England to Holland to the New World. He talked to scholars and historians, digging in on the faith of the Founding Fathers.

What he found, he said, is a forgotten historical narrative not taught in schools.

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Those first principles, as Cameron sees them, are spelled out in a scene depicting a large stone monument near Massachusetts’ Plymouth Rock, the spot memorialized as the place the Pilgrims landed.

“Faith in God … produces character, character will produce courage, courage to face the challenges of the day,” Cameron says in the movie, riffing off the Pilgrims’ story.

Cameron teamed with NCM Fathom, a company that streams live events to movie theaters nationwide, like live performances of the Metropolitan Opera and boxing matches, to offer a sneak peek at the film a couple of weekends ago. That debut was emceed by Cameron, featured live performances by Christian bands and was beamed out live on more than 600 screens, grossing $1.23 million, according to NCM and Cameron's publicist.

The new documentary has faced criticism for its inclusion of self-taught evangelical Christian historian David Barton.

A favorite among evangelicals for his Christian-centric views of the Founding Fathers and his vast collection of historical documents, Barton is heavily featured in the film.

“The reason I went to go see David Barton is because he owns the largest collection of original source documents from the founding era that I can get my hands on and that you can go and see,” Cameron said.

“When you look at those documents it becomes incredibly clear there has been a lot of cherry picking of the evidence done to support a very particular worldview, and that’s the worldview our children are learning in school and it’s not the full and complete historical record because it doesn’t reflect the faith of our Founding Fathers,” the actor said.

In a version of the film made available for screening and in clips posted online, Barton shows Cameron the “Thompson Hot Press Bible,” which Barton said was printed in 1798 and was funded by 12 signers of the Constitution and the Declaration of Independence, including John Adams and Thomas Jefferson.

“They wanted the word of God out to every family,” Barton says in the clip. “If these guys happen to be Christians it makes a lot of sense.”

Barton then picks up a small rare Bible known as the “Aitken Bible.” “The Bible of the Revolution was printed by the Congress of the United States. So Congress printed the first English Language version of the Bible,” Barton said. He goes on to say the Congress said, “This was a neat edition of the Bible for use in our schools.”

Warren Throckmorton, an associate professor of psychology at Grove City College, a private Christian school in Pennsylvania, has criticized Barton’s version of history and Cameron’s films.

About much of the history featured in the film, Throckmorton said, “That’s just not what happened.”

After seeing clips of the documentary, Throckmorton fact-checked some parts.

He said he found that the “Thompson Hot Press Bible” was not funded in total by 12 Founders. Instead, he said, the Bible was funded by a subscription base of 1,200 customers that included 12 Founding Fathers. “The printers funded that Bible, the Founders didn’t fund it. It was a business venture for them.”

As for the quote Barton attributed to Congress about putting the Bible in schools, it actually came from Robert Aitken’s petition to Congress. Aitken was a colonial printer. The Journals of Congress from 1782 shows Aitken completed the Bible on his own and sought the blessing of Congress.

The record shows a report from two congressional chaplains who examined the work, which they praised.

Congress passed a resolution to recommend “this edition of the Bible to the inhabitants of the United States and hereby authorize him to publish this recommendation in the manner he shall think proper.” That resolution did not mention it being put in schools.

“David Barton gets the facts wrong when it comes to these two Bibles,” Throckmorton said. “The facts of the case are stretched and embellished to create a narrative that is misleading.”

Cameron defended Barton’s work. “No one is more guilty of cherry picking evidence than those who bow to the god of political correctness, especially historians,” Cameron said. “Everyone is going to select the information that is important to their thesis. If you’re bent on being politically correct, it’s very easy to fall into that trap.”

Throckmorton noted that he and other critics of Barton’s work hail from Christian colleges and universities.

Early controversy surrounding Cameron's comments on social issues have given the film more media coverage than Cameron could have imagined for a small-budget documentary.

Appearing on CNN’s Piers Morgan Tonight last month, Cameron fielded questions about abortion, gay marriage and what he would do if one of his six children came out to him as gay.

None of the topics appear in the film, but Cameron expressed views on same-sex marriage, abortion and homosexuality that are common among conservative evangelical Christians.

Cameron called homosexuality “unnatural,” adding, “I think that it's detrimental, and ultimately destructive to so many of the foundations of civilization."

His comments sparked outrage from gay rights groups like GLAAD, the Gay and Lesbian Alliance Against Defamation. The group led a campaign to counter Cameron’s comments with other 1980s TV stars and evangelicals on the other side of the theological spectrum.

GLAAD spotlighted a bevy of celebrities who chided Cameron for his positions on homosexuality, including a tweet from Rosanne Barr, who suggested Cameron was “an accomplice to murder with his hate speech.”

Cameron said his support for traditional marriage is rooted in faith and thinks it should inform policy decisions: “You either believe marriage and human sexuality are sacred or you do not.”

Cameron jokingly described his faith as “high octane” but said he considers himself part of the evangelical Christian tradition. He said he goes to a small nondenominational community church near his home in California, though his publicist later clarified that he is not a member of the church, whose name he would not disclose because of privacy and security concerns.

Cameron said he was caught off guard by the controversy around his comments.

“It is my goal to love everyone. I hate no one,” he said. “Regardless of their race, religion, their proclivities, the desire of their heart and how they want to live their life and the decisions that they make. I can even respect people’s decisions and lifestyle choices just as I hope they have the courtesy to respect my decisions and my choices.”