One of the more complicated aspects of God to understand is the Trinity; the Father, the Son and the Holy Spirit. The Word shows one God, but in three forms.
God is one: in Mark 12:29 (KJV) “Jesus answered, ‘The foremost is, Hear, O Israel! The Lord our God is one Lord’“.
One, yet plural: In Genesis 1:26 (KJV) it says, “Then God said, ‘Let Us make man in Our image, according to Our likeness; let them have dominion over the fish of the sea, over the birds of the air, and over the cattle, over all the earth and over every creeping thing that creeps on the earth.’ “.