None of that is relevant. There was a time when Christianity was new. Same with Mormonism, Islam, Judaism and all the rest. Believers in each "know" that they're right, outsiders "know" that they're wrong.
It's not your place, or mine to evaluate their validity for the government, only for our own lives. All faiths are equal under the law so long as they have legitimate followers who believe of their own free will.
And once the government starts handing out preferences, they have to give the preferences to all faiths, even those that you or I think are silly.
Wicca does not fit the definition of "a religion" period.
It is not cohesive, has no set of principles, every practitioner is independent of every other practitioner.
I know of those who claim to practice "wicca". Crazy lonely cat lady comes to mind.
Just to keep this legal, the santarians do not have similar problems with their animal sacrifices when they conflict with zoning laws.
There are acceptable limits. Human sacrifice is outlawed despite some "very sincere" people who believe in it as part of their religion. Canibalism is not allowed despite some "very sincere" people who believe in it as part of their religion.
It is as looney as the "gaea" envirowakos who believe the earth is a living INTELLIGENT organism capable of thought. Christianity was built upon a prior religion and has been demonstrated over time, a dictionary definition of religion.
It is not an issue of "knowing right". It is simple the fact that Wica is a scam to get one laid. It was a scam at the inception by Mr. Gardner, and it is a scam today.
I bet this woman believes her mood ring is a religious symbol too.