Someone I’d never met came up to me after I spoke at a conference. “I’ve got a problem with you,” he said, face sour. “Take a number,” I said.

I so emphatically agree with John piper's assessment of this that I'm quoting his whole blog on it. Do NOT interpret the name change as compromise, but only as good strategy.

I’m often asked why I use the term “Elyon” in reference to God in my novels. Though I am comfortable making up names for men and angels for the purposes of fiction, I would not presume to make up a name for God.