That alone isn't limited. But there are certain parts of the different doctrines that I do think limits the definition. My point is, because I don't accept any one entire doctrine, I think it would be dishonest to call myself a Catholic or Christian. Meanwhile, there are people who just go through the motions, but there's very little substance to their faith. I'd say the guy in this article qualifies as one of them.
I recently dropped out of an interdenominational Christian group where I had remained on the sidelines for two years allowing others to take the lead because I thought they were true believers. I stood aside, let them give the orders, and I just helped out wherever they wanted. As it turns out, they are buffet-style Christians, picking and choosing, and are even less of believers than I am.
I should add that I left that Christian group over a discussion with the leadership on this very issue: same-sex "marriage". They were in favor of it. There's more to the story, but that's why this article caught my attention.