God revealed himself to Moses and said :
I am that I am. Exodus 3:14 KJV.
The revelation was, in part, the way in which he spoke, from a bush which burned and was not consumed. There was a living, burning flame and, separate and distinct, a living bush that did not fuel the flame, and was not consumed by the flame.
Out of that, spoke the Messenger of the Lord, Exodus 3:2, who is also God, Exodus 3:4.
By faith, I understand that here is a revelation of Deity united with humanity (a supernatural self-sustaining flame in intimate contact with that which grew out of earth and is nourished by earth).
Here is what Malachi writes of in the first few verses of chapter 3 - the Messenger of the Covenant, who is ... the Lord himself.
With the coming of the Son, the Father - also - was revealed.
And the Son also revealed the Holy Spirit.
By examining, carefully, the documented words of Jesus Christ and by examining also the documented words of the twelve whom he, specifically, authorised to express the gospel, one can arrive at an understanding - if one is granted revelation through the gift of faith - of whom God is, personally, and what God is in his own nature.
He is what he is.
And he has revealed what he is, to faith.
The fact that various individuals or groups of individuals have had disputes about these matters does not alter the reliability of the documentation or the reliability of the way in which faith works (by Divine revelation).
The problem is unbelief and its close companion - ignorance.