The idea of the Trinity
I can understand that God can have various Attributes/Names, but He remains One God. God is The Lord, The Gracious, The Merciful, The Master of the Day of Judgement, The Sovereign, The Holy One, The Source of Peace, The Bestower of Security, The Protector, The Mighty, The Compeller, The Majestic, The Creator, The Maker, The Fashioner, The Great Forgiver, The Subduer, The Bestower, The Provider, The Judge, The All-Knowing, The Exalter, The All-Hearing, The All-Seeing, The Just, The All-Aware, The Most Appreciating, The Reckoner, The Noble, The Bountiful, The Loving, The Glorious, The Wise, The Answerer(of prayers), The Truth, The Raiser (of the dead), The Giver of Life, The Friend, The Strong, The One, The Independant and Besought of All, The All-Sustaining, The Omnipotent.
I could continue, God has many more Attributes or Names according to the Qur'an.