[tsm]

This doesn't contradict Trinitarian theology, by the way—Jesus and God being one falls into "three in one and one in three".

It's perhaps also worth noting that trinitarianism is so fundamental to mainstream orthodox Christianity that mainstream orthodox Christians consider it deeply heretical to reject the Trinity. This was a major result of some of the early ecumenical counsels. They put together the Nicene Creed (and by virtue of being a "creed", not a "catechism", disagreement with it is heretical by definition) that defines the three persons of the Trinity, including "Jesus Christ…eternally begotten of the Father; God from God, Light from Light; true God from true God; begotten, not made; of one being with the father"