Why do many monotheists seem to see polytheism as illegitimate?

Again, it always starts with a premise.  I have seen the studies which is why I acknowledged that many might disagree. But having seen the studies - I was not persuaded by the science nor of the theories behind them.   

You cannot start with a conclusion and work backwards and expect to reliably arrive at truth. That is called confirmation bias and is the reason for your self inflicted scientific ignorance. 

EtrnlVw, wrote: 

I would say polytheism probably came before monotheism and monotheism only came about as a misunderstanding of polytheism

 #2

So tell me - why do think logic and reason is a good place to start? And please do so without using any logic or reason. 

This is why evolutionists only ever end up thinking evolution is correct.  It is also why they ignore every other bit of information elsewhere. Confirmation Bias. 

Okay I have no recollection of making this thread at all and I'm kind of having a dissociative identity panic response, like there's another me or Doppelganger Castin I need to find and shoot in the head before she makes more threads that do not reflect any personality I am aware of.

I liked doppleganger Castin more, she chatted with me and was friendly.

For example, the Catholic Encyclopedia states, "Formal dogmatic atheism is self-refuting, and has never de facto won the reasoned assent of any considerable number of men. Nor can polytheism, however easily it may take hold of the popular imagination, ever satisfy the mind of a philosopher."

Dawkins: "It is not clear why the change from polytheism to monotheism should be assumed to be a self-evidently progressive improvement."

I must say it isn't clear to me either. Do you believe polytheism is somehow less evolved than monotheism? If so, why? And if not, why do you think others do?

I would take the view that monotheism is the original and that polytheism is the later.  Yes, I know current thinking rejects this for all sorts of reasons.  But the Biblical picture commences with ONE GOD and humanity made in God's image.  As man learned more and more wisdom they started seeing gods everywhere and behind everything. And ironically, enough the gods started looking more and more like man. Hence - it went from ONE GOD with humanity made in God's image to many gods all made in the image of humanity and its variants.  

Oh the wonder of human wisdom. 

In Biblical Wisdom - Things devolve over time due to the taint of sin. And only after Jesus came - did the curse start to reverse - in respect of the way the world began to mature.  In this sense it follows the second law of thermodynamics but then in Christ - starts something wonderful and new. 

The wisdom of humanity - perceived in things like evolutionary theory - dismiss science - particularly the second law of dynamics - in terms of the bigger picture. They would rather talk about the ascent of humanity. Rather than its descent. Ah the wisdom of humanity.