On the one hand, this is funny.
On the other hand ... I wish that our churches were dangerous enough to merit putting up warning signs.
I am reminded of what the Beaver said to Lucy:
"Then he isn't safe?" said Lucy.
"Safe?" said Mr. Beaver, "don't you hear what Mrs. Beaver tells you? Who said anything about safe? 'Course he isn't safe. But he's good. He's the King, I tell you."