A theist yet skeptical friend of mine sent me a link to a song on YouTube. It is called "God is not a White Man." The song tries to paint a very nice picture of god and present religion as being less ethnocentric. It has a catchy tune, but the lyrics are idiotic and keep repeating "god is love." I find that offensive so I posted my opinion on YouTube. You can imagine the response.
Send them back a few Corporate Avenger songs. I think "The Bible is Bullshit" and "Christians Murdered Indians" should get the point across nicely. Maybe throw in "Jesus Christ Homosexual" just for good measure.