It is food for thought. If you believe in a god, must you also believe in the opposite. If you believe in yin, must you believe in yang? Or is a god bigger and all-inclusive? My concept of a god is all-inclusive, and prohibits an opposite. God is the life force in all living things, so the only opposite would be a non-living thing, such as a rock. I don't believe in good and evil, only shades of desirable and less desirable behavior. Drawing the line is a murky endeavor at best.