I would think so, I don't know of any religions that don't have that balance, even if its not God and Satan, like neo-pagan for instance
Actually, neopagans don't believe in an evil god -here's a bit taken from their website (and explains far better than I could ever attempt to!)

Neopagans do not believe in, respect, or worship any divine or semidivine figure of ultimate Evil, leaving such concepts to the dualistic monotheists. “The Devil” is a character in Christian and Islamic mythology, a blasphemous parody of ancient Paleopagan deities, and an entity we have not the least bit of interest in. Those who insist that our beloved deities are “really demons in disguise,” are simply exhibiting their ignorance, their dualism, and their bigotry, as their predecessors have been doing for centuries. Thus our community says to both the conservative Christian community and its shadow side, the modern Satanist movement, One cannot be a Satanist and a Neopagan at the same time, though it is, perhaps, possible to be a Satanist and a Mesopagan simultaneously.

Not that I know if there are any other neo's on here other than me..... LOL