We believe in one God, co-existent, co-eternal, and co-equal, in three Persons: Father, Son, and Holy Spirit; distinguishable but indivisible.
Colossians 2:9 NKJV
For in Him dwells all the fullness of the Godhead bodily;
Isaiah 43:10 NKJV
….. That you may know and believe Me,
And understand that I am He.
Before Me there was no God formed,
Nor shall there be after Me.
Isaiah 45:21 NKJV
…...Who has told it from that time?
Have not I, the LORD?
And there is no other God besides Me,
A just God and a Savior;
There is none besides Me.