Am I being too much of a Jerk when I do this?

Everytime my friend Amy say's something like "Praise Jesus" or she attributes something that happens to her to god. Ex. "God showed me that I was being too prideful so he caused me to wreck my car to teach me a lesson." I mock her by saying things like "Thank Zeus that I made it to work safe"....or "I had a really bad headache and I prayed to Zeus and it went away." she gets mad at me but I tell her that when she can prove to me that Zeus didn't take away my headache then I will stop saying it. I personally think that all atheists should start doing it because like Thomas Jefferson says "Ridicule is the only weapon against unintelligible propositions".