Well, "Allah" is the same entity as any Christian or Jew would pray to. It's all referring to the same deity, so I don't really see the issue many hard-liners have with it. The idea that "Allah" is exclusively the God of Islam or a false god is silly to me.
After hearing this song from a band with a definite Christian lean to their lyrics (I've heard Aaron talk about Jesus during performance), I was interested to hear what other people thought about the use of 'Allah' in their music. Some good discussions: