Both of our vehicles are covered in stickers and we rebuy stickers with each new car.
One of our favorites is
"Hatred is learned behavior"
We also have
"Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind." with a delicate rainbow curved line at the bottom.
"Never underestimate the power of stupid people in large numbers"
Those are a few of the favorites that aren't pagan related.