I remember a family trip in the 70's when I was about 10. We drove by a huge cross emblazoned with "Jesus Saves".
I let out a harumph under my breath. My father, a former presbyterian minister said. "It should read 'Jesus Sucks'..."
It as the coolest thing he'd ever said and ever would say.
My daughter and I were pondering a church marquee sign in our town with the message:
God is our steering wheel,
Not our spare tire.
Things that make you go 'hmmmm'?
We both came to the conclusion that Christians aren't supposed to just use their religion in emergencies but as a guiding force. But I think it's interesting how 'drive-by' religious messages cleverly 'hook' the reader as a marketing device! I agree with your daughter's observation that drivers SHOULD keep their eyes on the ROAD, however, and all these distractions don't help except in places where people are commuting on long boring roads or roads that get backed up a lot. And humor goes a long way if it's not too stale: for ex:
What's Missing? CH CH. UR. (sigh).
I keep reading material IN my car so I don't have to depend on external sources. I guess THAT is a metaphor for my everyday life philosophy, as well: Keep your wacky ideas inside and don't force them on others unless the situation calls for it.... I don't like to be 'fished for' by Christians or any other group. Call me fiercely independent! I will defend my atheism if the need arises but I don't 'proselytize' my lack of beliefs.