Long before the founding of Christianity the idea of a triune god or a god-in-three persons was a common belief in ancient religions. Although many of these religions had many minor deities, they distinctly acknowledged that there was one supreme God who consisted of three persons or essences.
The Babylonians used an equilateral triangle to represent this three-in-one god. Now it is the symbol of the modern three-in-one believers.
The Greek triad was composed of Zeus, Athena and Apollo. These three were said by the pagans to 'agree in one.'
One of the largest pagan temples built by the Romans was constructed at Ballbek (situated in present day Lebanon) to their Trinity of Jupiter, Mercury and Venus.
In Babylon the planet Venus was revered as special and was worshipped as a Trinity consisting of Venus, the moon and the sun. This triad became the Babylonian holy Trinity in the fourteenth century before Christ.
Although other religions for thousands of years before Christ was born worshipped a triune god, the Trinity was not a part of Christian dogma and formal documents of the first three centuries after Christ.
That there was no formal, established doctrine of the Trinity until the fourth century is a fully documented historical fact.
Clearly, historians of church dogma and systematic theologians agree that the idea of a Christian Trinity was not a part of the first century church.
The twelve apostles never subscribed to it or received revelation about it.
Trinity -- gods of the Nations
Assyria: Ninus. Hercules. Beltis
Babylon: Nimrod. Tammuz. Semiramus
Babylon: Belus. Tammuz. Rhea, Ishtar
China: Pan-Ku. Yi – Heng-O. MaTsoopo
Egypt: Osiris. Horus. Isis (Ra)
Greece: Zeus. Apollo. Athena
India: Brahama. Vishnu. Shiva
Mexico: Teotl. Quetzalcoatl. Coatlicue
NZ Maori: Tarang. Maui. Tiki-Tiki
Phoenicians: El. Bacchus. Astarte
Rome: Jupiter. Mars. Venus
Scandinavia: Odin. Balder. Frigg, Freyia