actually, you don't need to. i'm not sure what occult religion you follow, but i'll use wicca as it's the biggest on the site. wicca is a spiritual path, you pray to the god and goddess, and try and live in balance with nature. magic is not needed. magic is optional. what isn't optional is try to not harm. other than that, it's up to you.
myself, i started out wiccan, and i collect spells, and help others through spells, but i've rarely cast for myself. i use to believe in the god and goddess, while i still do, i now look more to dragons. i still feel strong with nature, and i try to live a balanced life, which means i don't over do anything [or try not to] and believe we need to eat meat, so not being a vegetarian is fine.
that being said, some people believe we should be vegitarian to be wiccan, others thing vegan, some believe only the godess matters, and some say the god. it comes down to what you feel is right by you. the only real thing that can't be argued is As it Harm None, do What Thou Wilt.