Before the rising of the Abrahamic religions the Western and the Eastern meditators were aware of the concepts known as Eastern Yoga and Western Yoga.
The Eastern Yoga is the sum of Kriya Tantra, Charya Tantra, Yoga Tantra, Mahayoga, Anuyoga and Atiyoga. The Western Yoga is the mystical qblh, and there is also the Way of the Catholic Church that is based on Mantra and Bhakti Yoga.
The Eastern Yoga was designed according to the East Dharma, and the Western Yoga was designed according to the West Dharma. And the Eastern Yoga defines “trinity” (in Sanskrit “trikaya” -kaya means body/ hypostasis/ dimension of existence) as Dharmakaya, Sambhogakaya and Nirmanakaya.
Trikaya is a conception used in order to ease the meditators to decipher the manifestation of the Perfect Existence within three pillars, which they somehow look like the following three existential dimensions of the Human:
The first is “Body”, and this notion goes beyond our body itself for it is also the sole dimension of which we are all aware, the dimension that we cannot refuse its existence, the dimension that is understood as reality, as the physical world that we perceive by means of our 6 senses.
The second is “Logos” and stands for “energy”, therefore it is a dimensional level that offers life to our physical body. This energy is linked to our respiration and to our mental/ sentimental condition, and it is called “Logos” because through respiration we produce the sounds that we use in order to communicate by means of our language.
And the third is “Spirit”, and it is the most hidden dimension of the trikayan nature of the Human: we know that we are capable of thinking but for the time being nobody can define the origins and the nature of our thoughts.
So the nature of Dharmakaya is the void/ emptiness/ sunyata.
The nature of Sambhogakaya is the Enlightenment.
The nature of Nirmanakaya is the way to the Enlightenment.
Therefore Dharmakaya is manifested at the level of Shambogakaya as clear light; and Dharmakaya is manifested at the level of Nirmanakaya as our physical universe, which is a phenomenal world -a Floating World.
Clearly, Nirmanakaya is the mingling of the Floating World and of the Void. Sambhogakaya is the mingling of the Enlightenment and of the Void. And Dharmakaya is the mingling of the Awareness and of the Void.
Due to the above methinks the Christian Trinity is a bad copy-paste of Trikaya. So it is no mystery at all the fact that until this very moment the Trinitarian Christians are unable to explain rationally this invention of theirs whilst Trikaya is fully understandable regardless of one’s personal beliefs and religion