Why do some christains think Wicca is evil?

NOTE: i said some Christians not all many good friends of mine are christian. But some think we serve "satin" when "satin" is not even a part of Wicca. And they think we are all about spreading evil and harming others. When a core belief in Wicca is "and it harm none do what ye will." so my question is why do some of them hate us? was it how they were raised?