This is a good example of the importance of foundational assumptions behind an argument.
In this case, Mr. Coren may be mostly correct. Let us leave aside the Roman Catholic doctrine that non-Catholic followers of Christ are going to suffer the same fate as those who do not follow Christ at all. Supposing for the sake of the argument that they are right about all the other doctrines including the silly ones that they adopted to make it easier for pagans to Christianize. So what? The foundational assumption is that being right is what is important. Maybe it is not. I don’t recall one of the commandments being “Thou shalt be right” Micah 6:8 does not say … what does the LORD require of you? Do the right sacraments, have the right theology and go to the right church”. I also don’t recall a “Blessed are they who believe correctly about God for they and only they will inherit the Kingdom of Heaven.”
Christianity is not about being right.
This topic is near and dear to my heart because it is pertinent to the state of the evangelical church today. We are divided because we have so many little Popes who all want to be right. Evangelicals love to point at the Catholics as an example of how to do it wrong and yet we make so many of the same mistakes.
The problem with being right is that we will not really know until we get to heaven. So then what, are we going to laugh at the people who were wrong. Are we going to pridefully strut around? The goal of being right is be able to please God. We study God for the same reason we study our spouse. We want to be able to do those things that please them. With spouses we want to know what kind of gifts or chores are most appreciated. Same with God.