Up until now, I saw Christianity as a whole to be monotheistic (there is only one god that created the world, is all-powerful and intervenes in the world).
Whilst looking at monotheism and henotheism ...
I thought that the trinity came from the following revelations
(1) There is one God (I myself am He! There is no god besides me.)
(2) The Father is God
(3) Jesus is God
(4) The Holy Spirit is God
Trinitarians believe that there is one substance of God subsisting in three distinct persons: Father, Son and Holy Spirit.
My question is what is this substance/nature of God based on Trinitarians?