Is this 'laugh out loud' funny to you, or just clever? Maybe it reasonates with Lutherans who often think of how their hymns are different from the standard Anglican Christmas hymns that are more popular in Anglo societies. When I saw the video, I remembered hearing 'Away in a Manger' was written by Martin Luther, and it sounds like one of the hymns criticized, but I looked that up and it seems extremely unlikely that he wrote that one.It's satire, not accurate historical narrative.its just supposed to be funny.
I've seen a few of these videos, and they aren't exactly what I'd consider funny, and I've seen one or two that were too sacrilegious... kind of like the Babylon Bee. Except before that one changed hands, some of the headlines might elicit a chuckle, but the kind that made me feel a bit guilty for laughing at something that was mean, like the one about a Stryper concert making Rob Bell consider the idea that there really is a Hell.