[ArGee]

Men do use magic, as do elves, and orcs.

Men do not use magic. Gandalf is not a man. Elves and orcs are not men. Sauron may be a man, that part wasn't clear, but I think he was of the same race as Gandalf.

And, again, the rings are powerful, not magical. There is a huge difference. Galadriel didn't like the term magic because, to her, it was nothing unusual. It was just life as normal for elves. It was only magical to the men and hobbits because they could not do it.

Shalom.

[Anitius Severinus Boethius]

Please re-read the Hollin gate part again. It states that Gandalf uses every opening spell known to elves, men, and orcs. No Gandalf, the rest of the Istari or Sauron are not men, but the Ringwraiths were. They were Kings and Queens who were also powerful sorcerors. The Lord of the Nazgul is called "The Witch King" and the Mouth of Sauron was a man who was a powerful sorceror. So yes, men did wield magic.

[Snuffington]

Sauron may be a man, that part wasn't clear, but I think he was of the same race as Gandalf.

Your thought is correct. Sauron is not a man, but rather "Maiar." Same as Gandalf in a general sense. If I recall, this is not made explicit in the Lord of the Rings. It comes from the Silmarilion.