Here is a site which talks of the infiltration of pagan symbols into Christianity and reasons pagan symbols should never be used, and of secret meanings of these symbols; Who Is The Roman Catholic Church Really …

No, surprisingly much of ancient Egyptian symbolism reflects Christian theology. That is why many believe Christianity stole their ideas from ancient Egypt; they forget that Joseph brought the true faith to Egypt when they made him "king".

The eye of Horus was used symbolically in Ancient Egypt; it may have to do with curses, such as the evil eye.