Those symbols, along with many others, are used in a variety of religions. The swastika is an ancient sun sign; the cross is pre-Christian and used in many pagan traditions as is the Sun, pentagram, etc. The upside down pentagram is used by the wives of Masons in the Order of the Eastern Star, as well as Satanists. I could go on and on.

Wicca is a gentle, Earth-based tradition that does not worship, nor even recognize the existence of, Satan and they most certainly do not perform human or animal sacrificial rites. The Wiccan Crede is "An it harm none, do what thou wilt". That is a highly limiting crede that is held above all things in the tradition and binds one to the vow to never harm anyone or anything save for self-defence.