"...doesn't all *religion reside in a dualist climate?"

There are several dualisms which appear in religious discourse. Some juxtapose the material from the spiritual, some the mind from the body, some good behaviour from bad, and some posit a good diety opposed to a bad diety. It was only in this latter sense that I suggested that Zoroastrianism is dualistic.

While there are elements of dualism in classic orthodox Christianity, the "good god verses bad god" is neither classic nor orthodox and has no place in Christian theology. In pop religion, on the other hand ...