The Vatican's chief astronomer declares that believing in aliens does not contradict a faith in God.
Clearly, an accord has been reached between the two great powers. "The Terrestrial Crusade" is at hand.
If you live near a Catholic "landing pad", lock up your children! (what?)
A Catholic alien invasion will eventually be undone by a combination of guilt and internal disagreement as to whether condoms are permissible for probes.