It isn't evil. You seem to be misinformed.  "LaVeyan Satanism, holds that Satan does not exist as a literal anthropomorphic entity, but rather as a symbol of a cosmos which Satanists perceive to be permeated and motivated by a force that has been given many names by humans over the course of time. In this religion, "Satan" is not viewed or depicted as a hubristic, irrational, and fraudulent creature, but is rather seen as being Prometheus-like in terms of attributes, symbolizing liberty and the like. To adherents, he also serves as a conceptual framework and an external metaphorical projection of the Satanist's highest personal potential. ...Satan is a symbol of Man living as his prideful, carnal nature dictates. The reality behind Satan is simply the dark evolutionary force of entropy that permeates all of nature and provides the drive for survival and propagation inherent in all living things." -wikipedia

So it's wrong if you believe Jewish prayer for example should be banned also.