Parenting 101 v14 - Burn in hell!

When I am confronted with a difficult parenting situation, I'll put the issue out there to plumb the depths of the vast parenting knowledge of my beloved readers....Here is our fourteenth edition of Parenting 101.
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Today at the supper table Lukas was telling us about his day at school.
He mentioned that some of the kids at school asked him if he was a Muslim or a Christian. Now, this happens all the time and the kids are usually nice about it. But this time when he said he was a Christian the kids gasped and said:

Oh no - you're a Christian! God only loves Muslims. You'll be put in a fiery place

Now I've never had somebody tell my child he's going to hell before. Wasn't really sure how to respond. Any advice?