If you'll notice, a number of pagan cultures had the idea of a savior who overcame death and/or a son of a god lighting the way for humanity. C.S. Lewis called these "good dreams," given to pagan cultures. Christ is the fulfillment of humanity's longing for a way to be right with God. He came out of the Jewish tradition, which is ancient, but He has universal appeal because His purpose was to save all of humanity.
Besides, paganism is really just the spiritual side of man's natural inclinations. Making gods of nature, of other humans, of themselves; calling all sorts of deviant behavior (such as homosexual temple prostitution) "sacred"; sacrificing humans to their idols--this is what humanity is like without God. Just because it may pre-date Christianity doesn't mean it has any validity.