QQ, have you ever considered the role of the "play of difference"? While you are trying to define your Universality and its "oneness" (or "indivisible wholeness" if you like), you keep rejecting the different aspects/elements of existence. For instance, your Ying/Yang example says that
yes but you can not "equally" -this is important- ignore the fact that the picture of Ying and Yang necessarily consist of Ying and Yang. That is to say, Ying and Yang are separately important as well. If you want me to delve into this example more deeply specify your points; however I assume your main point is not Ying and Yang but Universality. So let's go back to it...
Have you realised that while you are conceptually positioning your "oneness", you are necessarily using elements from "separated things" as if they are the opposition, in other way of saying it, the things that do not represent oneness, but represent the other way -as you said- a.k.a. dualism and its thought carriers (such as mind vs body; god vs followers; etc.). While your universalism tries to become different than non-universal entities, concepts, understandings, ideologies, etc. it takes them into account. Your universalism is trying not to be like them.
Play of difference is crucial in here, actually unavoidable: Your universalism can not define itself without stating its differences from non-universal ideologies. Its not an independent concept from them. But while you are trying to become different from them, in fact you are constructing your concept according to them. Therefore it is not independent per se. And you are simply creating another illusion while you are trying to refrain from it: Conceptual Universalism. And worse part of it, you find yourself in a position engaging dualism (universalism vs non-universalism) while trying to reject it.
Amusement for philosophy...
Often it seems that when people focus their attention they do so towards an extreme aspect and do so with out considering the opposing extremes. A form of bi polar were we consistently swing from one extreme to another over time.
Over the years I have had to learn that the key to finding balance or Moo [yoga] is to always consider both poles simultaneously and not over time, whilst focussing on an extreme within the range of possibilitis.
It is hard to describe it with out being suggestive of hypocrisy.
In Yogic practice for example a return to "Moo" or balance is achieved by focussing on both poles simultaneously thus rendering them nul and affording proper rest and relative peace [ through meditation techniques]. Essentially though to reduce the constant craving we have due to our various addictions to the extremes found in modern life.
It is not that hard to intellectually consider the polarised aspects simultanously however learning to live it can be quite a challenge.
So I disgaree with your comments that suggest hypocrisy or contradiction, because like you I am:
1] Talking from a typically accepted practice of mono poled perspective.
2] Attempting to communicate from this persepctive thus relying on relative appraisals of the notions presented.
Within the symbology of the Yin and Yang one could use a central point as the point of Moo or balance.
Imagine if you will a sheet of "rice paper" separating infinite pressures on both sides of the paper.
With out knowledge of the pressures and with out relative differentials the paper would apprear to be undisturbed by the significants of it's environment.
Until a differential is presented then suddenly pressures being applied become very relavent.
So in the main we are reacting to pressures with out realising the relativity of those pressures. [ The dualism employed leaves us ignorant of the dualism.]
Pantheism is about considering the whole and simultaneously consider the many aspects with in the whole [dualism] with out diminishing the whole.
Therefore the duality can be witnessed and experienced as relative to the whole.
A quick animated diagram may help:
The moving circle is symbolic of a center of perspective as it roams from one extreme to another. Moo is at the top in state of perfect balance.
[ normally this is unconsciousness or deep sleep state and not perfectly achievable in a conscious state.]