It's a spectrum, Wicca is somewhere between believing in the healing power of certain plants (certainly true) and full on "I can make spells that can hurt you because I watched The Craft."

I recently went to a "Witchcraft Fair" and there were so many people from every little niche thing. Tarot readers, crystal girls, candle spells and intention prayers, sex magic, literally dozens of different specific ways people did their thing.

sure. there are secular witches and they are generally accepted.

you probably can't be a secular Christian