Actually, Wicca as it's known today is a faith that was founded in the 1950's b y Gerald Gardner.
He took what he knew and understood of the OLD religion of Earth based Celtic Paganism and organized it into it's own entity.
In reality, many of the Holidays and rituals that are considered Wiccan, are based in much more ancient traditions.
I was raised in the ancient ways of my mother and her mother before her, and her mother, etc. They didn't use the term Witch, where Wicca does use the term. There wasn't the hierarchy in my upbringing that there is in Wicca. There was no High Priestess, or High Priest. They, in their times, and I now in mine, practice as solitary, or what might be said hedge witches.
I'll keep this at this, a simple but complete explanation.