what is wiccan religion? Is it the same with being an atheist?

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I often read about wiccan and witchcraft stuffs but i dont know if they also believe in God or a supernatural being because if it is not then they can be considered an atheist right? How are the charmed be related to wiccan- witches can also be good or bad? or generally they are bad and few are good? Please tell me anything about wiccan religion. Just curious about it