The name of the magazine isn't my creation. I'm just writing for it. 

I completely agree that the orthodox Christian belief is one of a literal Satan. This entire post is based on that premise. My argument is that this orthodox belief confounds the other central orthodox belief claim of monotheism. So arguing from your point is a nonstarter, because I concede that point. My point is that these orthodox beliefs are internally inconsistent. Perhaps you see the reasoning now?

My point is that this Christian belief in Satan — which is rampant throughout Christianity — has created this exact dualism you rightly disagree with. To say that it has at times run amuck is a vast, vast understatement. American evangelicalism is a primary culprit as well as medieval Christianity. This is not some ancient problem to ignore or snicker about. This is a very modern, very real, very widespread force within Christianity and not just in Anglo worlds. Pentecostalism, in case you are unaware, is the fastest-growing segment of the faith and this belief is particularly widespread in that perspective.  

I'm still waiting for dissenters to engage the post on its own merits and argument — that the being called Satan functions as a god — an eternal supernatural being with powers to influence humanity for its own purposes. In any other religious scheme, we would as Christians rightly call this a dualism and condemn as heretical. We just have  our own blinders on to our own inconsistencies.

Given the general disrespectful tone of your comment, however, I seem to have off-put you. What we call admitting our own bias in the field of theology is called honesty, or locating oneself. (It gives people an opportunity to dismiss arguments that make them uncomfortable based on personal reasons rather than actual reason.)