The Deus (God) is represented in this diagram more accurately by the Tetragrammaton, the Hebrew Name associated with His eternal nature. God is absolutely One without any division whatsoever and is beyond all description. Scripture challenges humanity,
Can you discover the depths of God? Can you discover the limits of the Almighty? (Job 11:7)
Further along it says,
Behold, God is exalted and we do not know Him. (Job 36:26)
God says of Himself,
“For My thoughts are not your thoughts, nor are your ways My ways,” declares the Lord. “For as the heavens are higher than the earth, so are My ways higher than your ways and My thoughts [higher] than your thoughts.” (Isaiah 55:8-9 says)
God is absolutely beyond human comprehension. He is certainly beyond description and nevertheless we continue to make attempts at describing something which might bring us closer to truth. Any name we apply to the transcendent Creator falls short. In this way, Judaism, wrestling with this same issue, has no advantage over Christianity. We simply cannot approach the topic of the Eternal First Cause without mediation. This is true even if the mediator employed be a Hebrew name or mystical idea. Any idea formed in the mind will fall short of God’s Glory and one will be left with the idolatry of an imagination rather than the transcendence of the unseen God.
We would be at an absolute loss if it had not been for the revelation of God’s Word. At Sinai, God did what seems to be impossible; He condensed His Will and Wisdom into words on a page. Like the cherubim covering the ark which would have been forbidden had they not been demanded by the Creator, the words of scripture have been permitted to convey the knowledge of Him who is otherwise unknown.
Although the words of scripture convey this knowledge, letter by letter, and word by word, at no time is the Essence of the Creator broken or divided into two or three. When approaching the subject of the Trinity we must keep this in mind.
The Eternal has been compared to a light so powerful no attempt can be made to look upon it—a blinding light. If this light is to be appreciated, it must be seen through a tinted lens of some kind or looked at through a tiny aperture. A Christian knows God through the three persons of the Trinity. It is extremely important to understand that the word “person” here is an English translation of “persona”—the word means “mask.” It would be best if we spoke of the three masks of the Trinity, Father, Son, and Holy Spirit. The Son is not the Father in disguise [1]; The Father is a mask through which we see the Deus; The Son is a mask through which we see the Deus and the Spirit is likewise a mask through which we see the Deus.
The “persona/mask,” as understood by the Church Fathers is not something which hides the Creator but rather reveals His Essence. This “mask” is the kind worn by ancient peoples hunting in the desert or the blinding artic. While the brightness of the light blinds a man, vision is possible when the light is seen through some constricted aperture. Christians do not worship three gods, but rather One God, unchanged and never divided but known through the three personas. This is classical Christianity.
[1] This is a common mistake and heresy called “modalism.”