If anything proves the validity of Occam's Razor,i it's contemplating the astounding attempts over two millennia to square Christianity's circle, or rather triangle. Trinitarianism: one God existing in three coequal, coeternal, consubstantial divine persons: God the Father, God the Son (Jesus Christ) and God the Holy Spirit, three distinct persons (hypostases) sharing one essence/ substance/ nature. The 'what' is one, the 'who' is three.
The Old Testament has been interpreted as referring to the Trinity in many places. One of these is the prophecy about the Messiah in Isaiah 9. The Messiah is called 'Wonderful, Counselor, Mighty God, Everlasting Father, Prince of Peace.' Some Christians see this verse as meaning the Messiah will represent the Trinity on Earth. This is because Counselor is a title for the Holy Spirit (John 14:26), the Trinity is God the Father, Jesus, Son, the Prince of Peace, the Counselor Spirit.
But this trinitarianism is very different from the Hindu Brahma (creator), Vishnu (sustainer), Shiva (destroyer), or the Roman Diana.