I see God can be proven to exist through Logical argument, but at the same time we can not know what God is, only that oneness is apparent.
There is a talk you may like to red here;
Bahá'í Reference Library - Selections From the Writings of ‘Abdu’l-Bahá, Pages 46-51
From. That talk;
"... Then how could it be possible for a contingent reality, that is, man, to understand the nature of that pre-existent Essence, the Divine Being? The difference in station between man and the Divine Reality is thousands upon thousands of times greater than the difference between vegetable and animal. And that which a human being would conjure up in his mind is but the fanciful image of his human condition, it doth not encompass God’s reality but rather is encompassed by it. That is, man graspeth his own illusory conceptions, but the Reality of Divinity can never be grasped: It, Itself, encompasseth all created things, and all created things are in Its grasp. That Divinity which man doth imagine for himself existeth only in his mind, not in truth. Man, however, existeth both in his mind and in truth; thus man is greater than that fanciful reality which he is able to imagine.... "
So all we can imagine about God, man is greater than those thoughts, we have not approached an understanding of God.
It could be that Man is the greatest proof of the Existance of God, Baha'u'llah in this passage quotes passages like Quran 41:53, 51:20-21;
".... To a supreme degree is this true of man, who, among all created things, hath been invested with the robe of such gifts, and hath been singled out for the glory of such distinction. For in him are potentially revealed all the attributes and names of God to a degree that no other created being hath excelled or surpassed. All these names and attributes are applicable to him. Even as He hath said: “Man is My mystery, and I am his mystery.” Manifold are the verses that have been repeatedly revealed in all the Heavenly Books and the Holy Scriptures, expressive of this most subtle and lofty theme. Even as He hath revealed: “We will surely show them Our signs in the world and within themselves.” Again He saith: “And also in your own selves: will ye not, then, behold the signs of God?” And yet again He revealeth: “And be ye not like those who forget God, and whom He hath therefore caused to forget their own selves.” In this connection, He Who is the eternal King—may the souls of all that dwell within the mystic Tabernacle be a sacrifice unto Him—hath spoken: “He hath known God who hath known himself.”
If we know our own selves, then we know there is naught but God. As to what is God, that only reverts back to knowledge of the Messenger.
Regards Tony