"Do they believe that Christ died for their sins? If they do, they're Christians. If they don't, they're not."

Sorry, Jack, it's not that simple and the case is most definitely not closed. That's ONE minister's interpretation of what Christianity is all about. Granted, there are a number of denominations that adhere to this, but not all! Not by a long sight!

This does NOT determine who is a Christian and who is not.

And I think you'll find that Islam is not anywhere near as simple as you seem to think it is. I've talked with a few Muslims of my acquaintance and they are just as splintered as Chistians are. God, Allah, or Big Daddy didn't make Himself (or Herself, in case it's Big Mama) all that clear on the matter, so pronouncements along that line tell you more about the person making the pronouncement than they do about the religion.

Don Firth