As for the negation of the Christian Trinity in the Quran - and this negation is extrinsic and conditional - we must take account of certain shades of meaning. The Trinity can be envisaged according to a vertical perspective or according to either of two horizontal perspectives, one of them being supreme and the other not. The vertical perspective- Beyond-Being, Being and Existence - envisages the hypostases as descending from Unity or from the Absolute - or from the Essence it could be said - which means that it envisages the degrees of Reality. The supreme horizontal perspective corresponds to the Vedantic triad Sat (supraontological Reality), Chit (Absolute Consciousness) and Ananda (Infinite Beatitude), which means that it envisages the Trinity inasmuch as It is hidden in Unity(1). The non-supreme horizontal perspective on the contrary situates Unity as an essence hidden within the Trinity, which is then ontological and represents the three fundamental aspects or modes of Pure Being, whence the triad : Being, Wisdom, Will (Father, Son, Spirit).Now the concept of a Trinity seen as a deployment (tajalli) of Unity or of the Absolute is in no way opposed to the unitary doctrine of Islam ; what is opposed to it is solely the attribution of absoluteness to the Trinity alone, or even to the ontological Trinity alone, as it is envisaged exoterically. This last point of view does not, strictly speaking, attain to the Absolute and this is as much as to say that it attributes an absolute character to what is relative and is ignorant of Maya and the degrees of reality or of illusion ; it does not conceive of the metaphysical - but not pantheistic - identity between manifestation and the Principle; still less, therefore, does it conceive of the consequence this identity implies from the point of view of the intellect and the knowledge which delivers.(1) The Absolute is not the Absolute inasmuch as it contains aspects, but inasmuch as It transcends them; inasmuch as It is Trinity It is therefore not Absolute.

~ Frithjof Schuon

The differences between religions are reflected very clearly in the different forms of sacred art: compared with Gothic art, above all in its “flamboyant” style, Islamic art is contemplative rather than volitive: it is “intellectual” and not “dramatic”, and it opposes the cold beauty of geometrical design to the mystical heroism of cathedrals. Islam is the perspective of “omnipresence” (“God is everywhere”), which coincides with that of “simultaneity” (“Truth has always been”); it aims at avoiding any “particularization” or “condensation”, any “unique fact” in time and space, although as a religion it necessarily includes an aspect of “unique fact”, without which it would be ineffective or even absurd. In other words Islam aims at what is “everywhere center”, and this is why, symbolically speaking, it replaces the cross with the cube or the woven fabric: it “decentralizes” and “universalizes” to the greatest possible extent, in the realm of art as in that of doctrine; it is opposed to any individualist mode and hence to any “personalist” mysticism. To express ourselves in geometrical terms, we could say that a point which seeks to be unique, and which thus becomes an absolute center, appears to Islam—in art as in theology—as a usurpation of the divine absoluteness and therefore as an “association” (shirk); there is only one single center, God, whence the prohibition against “centralizing” images, especially statues; even the Prophet, the human center of the tradition, has no right to a “Christic uniqueness” and is “decentralized” by the series of other Prophets; the same is true of Islam—or the Koran—which is similarly integrated in a universal “fabric” and a cosmic “rhythm”, having been preceded by other religions—or other “Books”—which it merely restores. The Kaaba, center of the Muslim world, becomes space as soon as one is inside the building: the ritual direction of prayer is then projected toward the four cardinal points.If Christianity is like a central fire, Islam on the contrary resembles a blanket of snow, at once unifying and leveling and having its center everywhere.

~ Frithjof Schuon