My Take on Light and Dark >> well I've read way too many books using the normal stereotype. But I also read a few newer ones were Dark was good and light was evil. Wheel of Time series has a band of self-righteous people that commited murder for their own personal gain and saw everything outside of themselves as evil, while the rest of the world held roughly the same view of them. Then the Aiseide (I spelled it wrong) live in the White Tower and do what they can to keep an evil god from resurrecting and everyone around their world view them as evil witches.
While the real bad guys hide in every position of power imaginable be it a highly religious/Holy position or one of a lowly peasant.
Only thing that sets the stereotype for Dark is Evil, and Light is good is the fact that no one fears light and everyone fears dark because dark is something that isn't easily explained. Things that are hard to explain are always associated with evil.
Oh and Video game wise...Tales of Symphonia and Grandia 2 Church=Embodiment of Light. Church is Evil in both games. Light = Evil in these games.