Zoroastrianism
Zoroastrianism is also dualist. Zoroastrians believe Ahura Mazda created the good spirits (Spenta Mainyu), and Angra Mainyu the demons. Zoroastrians believe people are free to choose between good and bad.  Choosing good will lead to happiness, and choosing bad will lead to unhappiness. So it is the best to choose good. Therefore, the motto of the religion is "Good Thoughts, Good Words, Good Deeds".