Where's the Beef? Or, What "Explanation"?

I just read Ferguson's piece--the whole thing. Alas, I can't find any explanation for the suggested relationship bewteen "faith" and "work". Isn't there a formal name for the following fallacy:

1. A has more C than D does.
2. A also has more E than D does.
3. Therefore, A has more E than D does *because* A has more C than D does.

Maybe I'm missing something. Wouldn't be the first time.

(If I weren't so hard at work this Saturday afternoon in early August, I'd probably be able to think about this matter more carefully ...)

Michael