Was Sauron a Balrog?

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Originally Posted by HurinThalion

That is a valid argument, yes. On the other hand I must point out that in the Silmarillion Tolkein says that the first spirits to join Melkor and that were the most like unto him were called Balrogs. Now who was the first of the Maiar that followed Melkor? Sauron.

But wasn't Sauron of Aulë's kin? He was a Maker, not a Whipper. He might have liked to decorate with flames, but can't remember ever reading that he was always wreathed in flame.