The belief that God is three persons in one: Father, Son, and Holy Spirit is an essential tenet of Christianity, but for Muslims, it contradicts the core principle of monotheism, the Oneness of Allah. Islam teaches that God is one and indivisible, and that associating partners with Him is the gravest sin. Thus, the notion of a triune God is seen as a form of idolatry and blasphemy.
The Quran strongly condemns the notion of Trinity and refutes it explicitly saying: "Say not 'Three' (Trinity): Desist, it will be better for you: For Allah is One God." (4:171). This ayah declares the Oneness of Allah and negates the idea of a plurality of persons in Godhead. It puts an end to any speculation regarding the Trinity as a divine mystery.
Moreover, the Quran highlights the semantic ambiguity of the term Trinity, which may lead to different interpretations. The word "Trinity" is not found in the Bible. It was coined by theologians to express the complex relationship between God, Jesus, and the Holy Spirit. However, this concept has led to divisions and disputes among Christians themselves, particularly between the Eastern and Western churches.
Islam, on the other hand, stresses on the absolute unity and simplicity of God. He is not composed of parts or attributes that can be divided or shared. Therefore, attributing partners to God contradicts the very essence of divine transcendence and uniqueness.
Furthermore, the Islamic view of Jesus Christ as a Prophet and Messenger of Allah is different from the Christian notion of him as the Son of God. Muslims believe in the birth of Jesus by Mary the Virgin but reject the idea of his divinity or being on an equal status with Allah. Instead, they see him as a human being who was chosen by Allah to deliver His Message to the Children of Israel.
In conclusion, Islam considers the Trinity as a theological error that violates the doctrine of monotheism. Muslims believe in the absolute Oneness of Allah. Any attempts to associate partners with Him is a sin. The Quran refutes the notion of a triune God. Therefore, the Islamic perspective on the Trinity is a clear expression of its commitment to the belief in one God.