Is FOX making Christian propaganda in the Simpsons?

For the record this is nothing to do with the Catholic Homer and Bart thing. I was watching the Simpsons, Treehouse of Horror XVIII, and I saw the Heck House part. In it there is what seems to be a paroday of a fundamentalist Hell House, I'll admit it was both scary and funny. But I've noticed that it is full of religious propaganda, if you watch it you'll know. Even the ending gives it all away! Keep in mind I know that Treehouse of Horror episodes never affect the rest of the series, but the fact of the mattter is that FOX is making and spreading outright propaganda and it needs to be stopped!