Fuzzy Bear isn't why religion is in decline, he's one of the minority of Americans who are actually taking their faith seriously.
Anybody who intertwines faith and politics has clearly never read The Screwtape Letters, or even considered what they are doing. It’s literally a defined tactic of the Devil himself. And as for your judgment rendered upon tens of millions of American Christians? ... I think that speaks for itself.
Not to directly defend Fuzzy Bear, who keeps going lower and lower in my esteem seemingly every day, but C.S. Lewis was a lay theologian whose writing on the subject of damnation, while influential for some very good reasons, is still merely intelligent speculation that can be disagreed with while still being a Christian in good standing. I say this as an avowed (but far from uncritical) Inklings man myself.