Pope Francis may be the most “political pope” in the history of the Roman Catholic Church, according to a new book by journalist George Neumayr, who takes a close look at Francis’ controversial leadership of the church.

“It is a pontificate, at times, beyond parody: Francis is the first pope to approve of adultery, flirt with proposals to bless gay marriages and cohabitation, tell atheists not to convert, tell Catholics to not breed ‘like rabbits,’ praise the Koran, support a secularized Europe, and celebrate Martin Luther,” the book’s description on Amazon points out.

“The Political Pope: How Pope Francis Is Delighting the Liberal Left and Abandoning Conservatives” was released Tuesday, May 2. Neumayr is a contributing editor and former executive editor of the American Spectator.

“Pope Francis is the most liberal pope in the history of the Catholic Church,” the book’s description online says. He is not only championing the causes of the global Left, but also undermining centuries-old Catholic teaching and practice.”

Related: The ‘Religious Left’ Is on the Move

Since his election to the papacy in 2013, Pope Francis has made controversial comments on social issues such as climate change, immigration reform, and the minimum wage.

“I call for a courageous and responsible effort to redirect our steps, and to avert the most serious effects of the environmental deterioration caused by human activity,” Francis told members of Congress in a joint address back in 2015, in regard to climate change. “I am convinced that we can make a difference and I have no doubt that the United States — and this Congress — have an important role to play.”

An interesting detail: Pope Francis had a communist mentor, according to the book.

“Pope Francis grew up in socialist Argentina, an experience that left a deep impression on his thinking,” an excerpt from the book (published on The American Spectator) says. “He told the Latin American journalists Javier Camara and Sebastian Pfaffen that as a young man he ‘read books of the Communist Party that my boss in the laboratory gave me’ and that ‘there was a period where I would wait anxiously for the newspaper La Vanguardia, which was not allowed to be sold with the other newspapers and was brought to us by the socialist militants.'”

“The ‘boss’ to whom Pope Francis referred is Esther Ballestrino de Careaga,” Neumayr says in his book. “He has described her as a ‘Paraguayan woman’ and a ‘fervent communist.’ He considers her one of his most important mentors.”

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Related: An Increasingly Political Pope Is Also Bringing the Faithful to Church

Neumayr co-authored (with the late Phyllis Schlafly, the conservative activist) the national bestseller “No Higher Power: Obama’s War on Religious Freedom” in 2012.

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In his new book, Neumayr addresses a concern that Pope Francis may be veering off doctrine.

“At a time of widespread moral relativism, Pope Francis is not defending the Church’s teachings but diluting them,” according to a description of the book. “At a time of Christian persecution, he is not strengthening Catholic identity but weakening it. Where other popes sought to save souls, he prefers to ‘save the planet’ and play politics, from habitual capitalism-bashing to his support for open borders and pacifism.”

The pope, however, apparently worries not one bit about this or how he is viewed by others who are dedicated to the church and care about its future.

Neumayr makes this clear in his book: “Pope Francis is shrugging off the mounting concerns and delighting in his reputation as a socialist and modernist maverick. After Pope Francis early in his papacy decried capitalism as ‘trickle-down economics’ — a polemical phrase coined by the left during the Reagan years that Francis frequently borrows — radio talk show host Rush Limbaugh commented, ‘This is just pure Marxism coming out of the mouth of the Pope.’ Talk show host Michael Savage called him ‘Lenin’s pope.’ Pope Francis took such comments as a compliment. ‘I have met many Marxists in my life who are good people, so I don’t feel offended,’ he told the Italian press.”