I'm using to prove that the allegation, that people are careful being 'out' as a Christian' exists, not to prove that the religious discrimination, which would be illegal, exists. Your point is that it couldn't possibly exist because you've never even heard of such a thing. I'm saying that it's entirely possible for it to exist, because everyone else seems to have heard of it to the point that a popular TV chose to lampoon it.

The point is that it was satirized in the show. Generally satire mocks or exaggerates something that actually happens in real life.