Muslims' Common Questions About Christianity - Why do you speak of three gods? Is not God One and Indivisible?

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84- Why do you speak of three gods? Is not God One and Indivisible?

Before any explanation, the best thing is to quote some Bible texts which emphasise the Christian belief in One God. First, from the Old Testament: 
--the first of the Ten Commandments, "I am the Lord your God…You shall have no other gods beside me"--Exodus 30: 2-3; 
--through the prophet Isaiah, the Lord declares, "Before me no god was formed, nor shall there be any after me. I, I am the Lord, and besides me there is no saviour. I am God, and also henceforth I am He"--Isaiah 43:10-13; 
--The Psalmist ends one of his prayers with the words, "Let them know that thou alone, whose name is the Lord, art the Most High over all the earth"--Psalm 83:18; 
--and some verses from the New Testament; the Lord Jesus repeats and confirms words from the Old Testament, "Hear, O Israel: the Lord our God, the Lord is One"--Mark 12:29; 
--the apostle Paul declares, "there is no god but One"--1 Corinthians 8:4; 
--and in another letter he adds, "(there is) one Lord, one faith, one baptism, one God and Father of us all, who is above all and through all, and in all"--Ephesians 4:5-6. 
This last verse is of special importance; it shows that God is not infinitely far off, like some great king living shut up in his palace, uninterested in the daily life and experience of the common people. The God of the Bible is a living God, full of sympathy for the least of His creatures, calling to them and coming to meet them. This God is "above all, through (or among) all, and in all"; He is the Holy One, the Creator--God, above all, the Father; He comes to mankind to demonstrate His justice and His forgiveness--God, among all, in Jesus Christ; He is at work in the hearts of men, in the Church and in the world--God, in all, by the Holy Spirit. 
The Apostle Paul writes frequently of God the Father, of the Lord Jesus Christ and of the Holy Spirit (e.g. Romans 15:15-16 and 30; 2 Corinthians 1: 21-22 and 13:14)--in each case, equally, he is indicating the reality of the One Living God, without whose mercy no man could stand! 
To illustrate these three ways in which God exists and acts, consider a certain Abraham Mgoki, who is a mechanic at Garousa; he is also the husband of Madame Mgoki, and again he is a member of the Evangelical Church. He may be in the workshop repairing cars, he may be at home with his wife, he may be at prayer in the church--he is always one and the same Mr. Abraham Mgoki. He is at once mechanic, father of his family and member of his church, yet always the same man. 
That is of course a very simple illustration, which must not be applied literally, and which does not claim to explain the mystery of the thrice Holy God.