Church bulletin art. Anybody that knows me, knows that I draw in church.
Even though the doodling may be in church, it is rarely inspired by what is going on in church (unless I'm drawing funny caricatures of the pastor or surrounding attendees). Jesus or any of the disciples rarely ever make their way into the doodles unless they're fighting off leviathans from the deep (they're fishermen so it's a possibility), or joining their magical walking staff powers into a concentrated beam to take out a horde of Satan's minions to save the world's supply of tacos (which might or might not contain real beef).
This particular beast, however, was inspired by a stained glass window decoration... well partly inspired. It is unfortunate that there are not any extraterrestrials portrayed in this particular church's stained glass windows. I'm sure most would argue that's a good thing. Unless you consider Jesus or angels to be extraterrestrial; they are other worldly.