That’s a good question. We don’t know. He hasn’t been completely forthcoming with reason for the change. Based on some research I do have a hypothesis. About a year ago, Mr. Coren had a change of heart visa vie same-sex marriage. While condemning the persecution of homosexuals in Russia and Africa, Mr. Coren says he received a lot of push back from the conservative Christian community. The lack of charity he experienced may have convinced him that Christian few on homosexuality was animated by hatred; consequently, he seems to have done an about face on the issue. This, in turn, lead to a greater push back among conservative Catholic/Christians which resulted in a greater feeling of alienation. Hence, he decides to worship in the Anglican Church of Canada where he could worship without constant judgement and criticism. Hence he still considers himself a Catholic but chooses to worship with the ACoC.
If that’s true, it does highlight a need to engage the culture with charity. I know that one of the aspects of contemporary feminism and liberalism that have turned me off is the way they talk about and refer to their political enemies. I can’t fault someone for doing the same.