I haven't seen him trying to impose anything. He is engaging in a debate on a forum that is basically set up for that purpose.
But by your definition damn near everything is considered a "religion". Capitalism is a religion, so is socialism, so is anarchy, so is "my favorite color is blue". Gun rights are a "religion" along with freedom of speech because most of us here try to impose them on other people. The list is endless. Damn, I should be getting all kinds of tax breaks if all that is a religion, maybe you are on to something here.
PS: I pretty much completely disagree with him.