He can't possibly be Christian if he believes people "cling" to their faith for any other reason than they believe it to be true. I think that
upset more people than anything else. Attending a church that calls itself Christian does not a Christian make.

I really don't think that is what he actually meant. That being said, people of all religions often "cling" to their religion because thats what
they were raised as and thats all they know.
Its really rather common.