But dualism should be able to exist without beiing allied to the belief in a Diety. In any proposal or concept there will have to be at least two opposing points of view. Or does duality only allow for and against. Duality, the word, does imply this, which seems to be an over simplification to me.

I thought Zoroastrianism was bigger than duality- (good and evil), -as it suggests the existence of order and chaos throughout the entire universe- not a code of morality.