Where does this 'soul' reside, and how does the physical body contain that which is non-physical?
You are still dwelling in the realm of a 'subject-object' split, where 'soul' is distinct from both God and you; where there is 'self and other'; 'man and God'. This is not divine union, which is reflected in the Hindu saying: 'Tat tvam asi': 'Thou art That': 'You are none other than the divine nature itself'. Why you fail to know that; to realize divine union, is the question. Any clues?
Herein lies the all important difference between the believer of orthodox teachings ( ie; the Bible), where the subject-object split is always retained, in which you are still distinct from That, and the mystic's experience, which is itself the direct living experience of divine union, and where you are none other than That.
"You are not just the drop in the ocean, you are the Mighty Ocean itself"
Rumi
Rumi is a favorite of mine also.
“Cleanse thou the rheum from out thine head
And breathe the breath of God instead.” - Rumi
You are referring to a certain belief of oneness...
“Only God exists; He is in all things, and all things are in Him.”
However, those who have attained to the Absolute reach a plane of oneness that is above this concept and is the furthermost goal a mystic traveler can ever hope to attain, to know God.
Only obedience to the laws of God, contrary to popular belief, can reveal God, a station beyond words. Once the knower has reached this station they know the truth about God and oneness and that He is exalted above all the limitations of His creatures.
“When the pen set to picturing this station,
It broke in pieces and the page was torn.”