Jesus never mentioned about trinity and you wont find the word trinity in the bible.
When you read the bible in gospel of John jesus said that:
I am and my father are one.
But if you read the whole context it means its in purpose that we are one not as a whole.
Exampl:
Lets say we play football to geather and in a team we are one in purpose. Not as a whole.
Its the Christains the bible say something and they utter their tongue and make something else whats suits them and it is the teachings of the churches not the bible.
So is Christanity based on jesus teachings or the churches.
THE TRINITY EXPLAINED TO MUSLIMS
By Abdullah Ibrahim
The Bible categorically pronounces that there is only one God!
Jesus:..."Hear, O Israel, the Lord our God, the Lord is one." (Mark 12:29, or Romans 3:29-30, James 2:19)
The Quran too testifies that Jews and Christians, the people of the Book, believe in one God:
And dispute ye not with the People of the Book, except with means better (than mere disputation), unless it be with those of them who inflict wrong (and injury): But say, "We believe in the Revelation which has come down to us and in that which came down to you; Our God and your God is One; and it is to Him we bow (in Islam)." (Surah 29, 'Ankabut, verse 46)
CLARIFYING MISUNDERSTANDINGS
The blasphemous idea of Christians worshipping three gods comes from a wrong understanding of the Trinity. In the fifth century AD there was a Christian cult called Maryanya which spread the false belief that Jesus and his mother Mary would be two separate gods besides God. The Quran was right to speak out against such impiety:
And behold! God will say: "O Jesus, the son of Mary, didst thou say unto men, 'Worship me and my mother as gods in derogation of God,?' He will say: 'Glory to Thee! Never could I say what I had no right (to say). Had I said such a thing, Thou wouldst indeed have known it. Thou knowest what is in my heart, though I know not what is in Thine. For Thou knowest in full all that is hidden.'" (Surah 5 Maida, verse 116)
To say, as the minority cult of the Maryanyas did, that Mary was the mother of God through whom He produced a physical son, and both were to be taken as separate gods besides God, is absurd! This ludicrous and heathen concept of the Trinity is completely condemned by both Islam and Christianity! The Quran rejects it in clear terms in Surah 4, Al Nisa, verse 171. The Trinity has also been missuderstood to mean that God is three persons and only one person at the same time and in the same sense. Neither are there three substances in one substance. In opposite to this contradictions the Christians definition of the Trinity is expressed in the Athenasian Creed: "We worship one God in Trinity, and Trinity in Unity; Neither confounding the Persons; nor dividing the Substance (Essence)" The word "person" is here used in the sense of "self with a particlular function." ("The Illustrated Bible Dictionary" by F.F. Bruce, IVP Leicester, 1962, see "person")
The danger one faces when confronted with extreme or complicated ideas, is, "to throw the baby out with the bath-water," this means to reject everything about a matter, even the true and the good. Here is what C.S. Lewis, professor of Medieval and Renaissance literature at Cambridge University has to say about such an attitude: "If Christianity was something we were making up, of course we could make it easier. But it is not. We cannot compete, in simplicity, with people who are inventing religions. How Could we? We are dealing with Fact. Of course anyone can be simple if he has no facts to bother about." ( "Mere Christianity", Macmillan Company, New York, 1943, page 145)
The main stream of Christianity throughout all the world believes in one God, the Holy Trinity. It is indeed a mystery, as God Himself is, and as eternity and infinity are. "It is held that although the doctrine is beyond the grasp of human reason, it is, like many of the formulations of physical science, not contrary to reason, and may be apprehended though it may not be comprehended by the human mind." (See, "Encyclopedia Americana", "Trinity", by F.C. Grant, Danbury, Con.: Americana Corp., 1980)
The religion of Islam too faces such intellectual challenges. The Quran speaks about God anthropomorphically (it uses human terms to describe him). Orthodox Muslims do not explain the "how". Similarly, it is a fact that God's word was revealed in a book, but how the infinite can be expressed in the finite is not clarified.
BIBLICAL FACTS
I will tell of the kindnesses of the LORD, the deeds for which he is to be praised, according to all the LORD has done for us - yes, the many good things he has done for the house of Israel, according to his compassion and many kindnesses. He said, "Surely they are my people, sons who will not be false to me"; and so he became their Savior. In all their distress he too was distressed, and the angel of