Photonic
Ad astra!
Pffft, Galadriel may be the most ancient and mightiest of the Noldor in Middle-Earth, but even so she could never harness enough power from the Ring (which would not obey her) to stop Sauron's onslaught. Sauron's military victory was totally assured unless the Ring was destroyed; even if the Ring were used against him. Then it would have just been a matter of time before he stripped it from the Elf-maiden, probably with his own bare hands!
Even Saruman, who was of the same stock and race as Sauron (though of much lesser stature) could have only hoped to use the Ring in a "slave's mockery" of Sauron's power -- and Saruman was considerably much more powerful than Galadriel.
That being said, Sauron himself was tiny and pathetic compared to the first and true Dark Lord (Melkor, a.k.a. Morgoth Bauglir); as even Tolkien described him thusly: "In after years [Sauron] rose like a shadow of Morgoth and a ghost of his malice, and walked behind him on the same ruinous path down into the Void."
Even at the height of his power, Ring and all, Sauron was just a "shadow" and a "ghost" of the original Dark Lord. Essentially, if we're going to worship anyone from Arda I'd go with Morgoth for you dark types, the Valar for polytheists, and Iluvatar for monotheists
Of those who sung into creation all that was known, Iluvatar was the first and foremost in the light.
However, it was written that Galadriel would have been one of the only that could have enslaved the rings creator and use his power to fuel her own. But she knew that the darkness of Saurons master would have eroded her, and while she would have used the ring for good at first, she knew it would not last. That was her test.