Once I was talking to a Muslim saying to him that Christians believe in the Unity of God. He informed me that Muslims do not believe in the Unity of God but in the Oneness of God. I got confused. Would you kindly elaborate the difference for me?

Thank you very much for raising a very fundamental principle in Islam. Muslims believe in the Oneness of God. They do not believe in the concept of Unity of God. The word unity may give a wrong impression about the concept of God. It may mean two gods in one, or three gods in one. Christians believe in three gods in one; God the father, god the son and god the holy spirit. Three in One. This is the concept of Unity of God. Muslims do not subscribe to this concept. God is the only One. He is One-in-One. He begets no one; and no one has begotten Him. He is the Creator of the whole universe. No one shares with Him His Sovereignty.