A truly inspired motif. Executed tasteful 'enough'... A bit sacrilegious... My kind of art! :3
I particularly like how you made the center figure (Mr. Fulp, our lord and constant companion) stand out even stronger through the use of a different art style. The t-shirt is a really nice touch. The flying saucers in the background both balance out Dad as well as fill up a backdrop that would have otherwise felt a bit too empty. I really appreciate these "little" touches that have a large impact.
Oh, but also... 'Nobody' is going to say it? 'Seriously...?' Well, I guess I'll 'have to' speak up then: "...but we're not a cult...!" ;)