Merlin was not a wizard, he was a druid. He didn’t become a wizard until Hollywood got a hold of him.
"In ancient times, hundreds of years before the dawn of history, lived a strange race of people... the druids. No one knows who they were, or what they were doing, but their legacy remains hewn into the living rock of Stonehenge."
There’s nothing to indicate Merlin was a druid at all. Now, if you ask any new ager: wizard = wiccan = druid. The truth, however, is that “The Order of Melchizadek” is an ancient name for the Catholic/Orthodox priesthood.
He was just a nutzo New Ager living in the woods