With the six soccer-ball stickers
Marked "Jacob" "Joshua" "Madison" "Hannah" "Ashley" and "Brianna"
And the gymnastics sticker
And the Jesus fish
And the "God is my co-pilot" sticker
And the window label with the big-eyed, pajama-clad infants clustered around a cross
Your "In case of rapture this vehicle will become un-manned," license plate frame is a public spirited warning
but probably unnecessary.
On the other hand, the pale, curly haired young man in the Smart car
with the FIVE apple stickers on various windows
and the Flying Spaghetti Monster icon
with the Darwin fish on the other side
didn't really need to let us know that "Guns don't kill people,
Type 2 phasers kill people." and he voted Kirk/Spock in 2008.