He has written more than ten books, including biographies of G. K. Chesterton, H. G. Wells, Arthur Conan Doyle, J. R. R. Tolkien and C. S. Lewis.

For several years, he was a columnist for Frank and then The Globe and Mail, before he began syndicated columns for the Financial Post and Sun Media in 1995.

[7] His career as a broadcaster began in the early 1990s when he co-hosted a political debate segment with Irshad Manji on TVOntario's Studio 2.

Coren argues that it was a satire comparing in his mind public attitude to third world starvation with North America's obsession with slimming and self-indulgence.

[7] Despite this acrimonious termination, Coren made regular talk show appearances on CFRB in July 2006, at the start of the 2006 Israel–Lebanon conflict, as he happened to be in Israel at the time.

[8] In the fall of 2007 he and former Liberal Party of Canada president Stephen LeDrew launched a daily hour-long afternoon show on CFRB called Two Bald Guys With Strong Opinions in which the two argue about the issues of the day.

[11] Following his conversion to Anglicanism, Coren began to publicly embrace socially liberal ideas such as support for same-sex marriage.

He stated that it negatively affected his career and that he became the target of personal attacks from former readers, observing that "there is none so angry as a fundamentalist scorned".

In 1994, the Ryerson Review of Journalism reported Coren's response to an interview question about the disease: "What I do is attack something like a double standard on AIDS.

[17]In September 2006, Coren published an article in the Toronto Sun supporting the use of tactical nuclear strikes against Iran.

[7] Michael Coren was profiled on Credo on Vision TV, and said that his father told him he could not attend his son's wedding in a Catholic church without becoming "physically sick".

[citation needed] In 1991, Coren said in a column for a humour magazine: "Evangelicals may be intolerant, small-minded, and repellent, but at least they hold a consistent set of beliefs".

Also in 1993, he had a falling out with the Catholic Church over an unflattering profile he wrote of Archbishop Aloysius Ambrozic for Toronto Life magazine.

[7] The bishop, who had made Coren a Knight of the Holy Sepulchre in October 1992, was quoted using words including "friggin" and "bitch", and said that the Spanish dictator Francisco Franco was a "conservative Catholic and not a bad fellow".

In one of his columns for the satirical humour magazine Frank, Michael Coren depicted Mother Teresa getting drunk in a bar.

He cites Thomas More, C. S. Lewis, Ronald Knox and his godfather Lord Longford as spiritual influences, and remains connected to the ecumenical scene in Canada and beyond.

[23] In an interview with the National Post on 1 May 2015, he cited the Catholic Church's teachings on homosexuality and contraception as some of the reasons for his conversion to Anglicanism.

[25] Coren supports infant circumcision, which he calls a "tradition [Jews and Muslims] consider holy and essential, based not in abuse and cruelty, but in concern and love for their child", and has said that its opponents are "irreligious zealots".