This is what the Yoga monastery from NM has about St Thomas. The same website that has the article about the Unknown Life of Jesus.
Before embarking on an outline of the various beliefs held by Saint Thomas Christians, it should be made clear that the teachings of Saint Thomas Christianity are not a set of imposed dogmas, but rather a way of spiritual life. Saint Thomas Christians emphasize spiritual practice and the experience and knowledge gained from such practice rather than the intellectual concepts of theology and dogma. Naturally there is a broad framework within which the Saint Thomas Christians pursue their spiritual life, but theological details are left up to the individual. Obviously a person who does not believe in God and in the spiritual legacy of Jesus (see The Christ of India) and the Apostle Thomas (see The Apostle of India) would not become or remain a Saint Thomas Christian. Yet there are certain concepts which, when rightly understood as metaphysical rules of the spiritual road, facilitate the individual’s seeking. They need not be blindly believed, but it helps to accept them provisionally–that is, with an open mind and the understanding that in time the seeker will come to know for himself their truth and relevance.
The Three Eternal Things
Saint Thomas Christians believe that there are three eternal things: the transcendental God beyond creation, the immanent God (Ishwara) and the individual spirits within him, and the eternally cycling creation. And these Three Eternals are the real Father, Son(s), and Holy Spirit.
God
God is the ever-existent Spirit, the Absolute Consciousness That encompasses all things but is encompassed by none. Therefore God is totally beyond the reach of the human intellect and utterly indefinable or intellectually comprehensible. We can easily say what God is not–for anything we might say will not express him; but we cannot say a single word about what he is.
In Vedic religion, Sanatana Dharma, God is referred to as Brahman, the Absolute Being that is transcendent and beyond any qualities or conditionings whatsoever. However, with the inconsistency that is a marked trait of Eastern thinking, the ancient seers have given us a definition that enables us to get as much of a grasp of God as is possible for our minds. God is said to be Sat-Chit-Ananda: Existence, Consciousness, and Bliss.
Sat
God does not exist in the sense that things in relativity exist. Rather, he is existence itself. Or, more to the point, God is the very ground, the basis, of existence, in and through which all things exist. He is the ocean and all else are the waves. “He shining, all things shine,” says the Veda, and: “His shadow is immortality.” God can equally fittingly be called Reality itself.
Chit
God is Pure Consciousness, the very Principle of Consciousness itself. He is therefore omniscient–not in the sense of just knowing all things in the present moment, but in the sense of knowing all things whatsoever–past, present, and future–simultaneously. This is because God is outside of time and all things are present to him; nothing is past and nothing is future. God is the Eternal Now. Since all things are known to him, we can say that God is Conscious, as well.
Ananda
“God is ever-new joy.” This was the definition of God given by the great Master, Paramhansa Yogananda. God is not joyful, he is joy itself. God, then, is ever-existent, infinitely-conscious bliss.
Link:
https://ocoy.org/original-christianity/esoteric-christian-beliefs/