There's a short Muslim credo that's taught from birth -- Muslims around the world would be able to say it in Arabic:
"Ilaha illa Allah. Muhammed rasul Allah." ("There is no god but Allah, Muhammad is the messenger of Allah")
The Christians executed in a relief agency in Pakistan last month were ID'd by the fact that they couldn't (or wouldn't) say it -- then they were shot in the head.
How about, "There is no god named Allah...Muhammed is the messenger of Satan..."
At least it's accurate.
Once you say that, then under shariya law you can be executed if you backslide.