Absolutely nothing about God would change if there were never a NT or an OT for that matter. The Bible is a gift of God.
I believe this is a little contradictory but I’ll bite. Let's go ahead and have this discussion then ... without the bible you said you didn't need, for that matter.
Without the NT, I would be interested to hear about what god there could be to supplicate oneself to if it is not YHWY?
First by the term "God" I mean God is a spiritual, substantial, personal Being, infinite in intelligence, in will and in all perfections, immutable, and infinitely superior to all that is or can be conceived apart from Himself. He is incomprehensible in His infinite perfections although knowable as to the fact of His existence as Creator and Lord of Heaven and earth, Almighty, Eternal, and distinct from all He has created.
The point I was making in my statement is that although Almighty God is not thoroughly comprehensible to us, we can attain a certain degree of knowledge concerning Him if there were never the Holy Bible to tell us of the infinite plenitude of His perfections. That 's why I said the Bible is a gift of God. Got is Eternal, He is, always was and always will be. That's why I said absolutely nothing about God would change if there were never the Bible. God and His Infinite Perfections are not subject to the Bible which was written in time and time began with God's creation.
God alone is; all else is dependent.
There is but One true God. The God of the OT is the same God in the NT. God is Eternal..He is, always was and always will be.
He is....means He does not become progressing from less to greater perfection. God is Eternal means He never ceases to be what He is or was or always will be, nor does He change. He alone is Infinite, and Eternal Being, Uncaused, yet casuing all else to receive being and such degrees of perfection as He chooses to bestow.
The finite human mind can affirm the perfections of God without the Bible.
For example, we can understand that there is an Infinite God without the Bible. Our reason tells us that there is one true God.
That there is an Almighty God must be clear to every thinking person for the fact is clearly proved by the visible world with its laws and orderliness which testifies to God's Wisdom. So we don't need the Bible to know that nature reveals God to us as the First Cause, the Designer and origin of life. If there were never the Bible, we can conceive the fact that there is a Being (God) not finite as are the things that Being has made. No one can reasonably think that the world made itself, nor the heavenly bodies move through space by their own power.
We can know that absolutely nothing about God would change if there were never a Holy Bible from the the supernatural light of Faith.
You seem to forget (or perhaps you never knew) that besides the Bible (Sacred Scripture), there is another Divine source of faith from which we can learn about God called Sacred Tradition. Tradition is a revealed truth not found in Scripture and can be found in ex cathedra documents of the Popes and Councils, in the Creeds, and in the works of the Fathers and Doctors of the Church, (some of whom were contemporaries of the Apostles.).