“God is not a book and the Sacred Scripture is but a mere shadow of the divine. The Bible is a means through which He chose to reveal a portion of Himself to us.”
God is not the physical book, of course not. Yet, the contents of the book are divine, they are the Word of God, and the Word of God is declared to be God. I don’t pretend to understand the exact spiritual technicalities of that mystery, anymore than I claim to be able to explain how the body of an outwardly ordinary man could contain the boundless essence of God. Yet, it is written, so I believe, and there’s nothing you can say to me to dissuade me of it.
I imagine if someone tried to convince you that God can’t be a piece of bread, you would adopt much the same attitude.
There is a difference between substance and property. The divine substance (epiousios) in the Eucharist has no relation to its host which maintains the properties of bread. Think of this as an encounter with the Jesus in the first century. Although He was 100% man and 100% God there would be no way for you to scientifically or forensically establish His divinity.
Peace be with you