Allah is absolutely one in being and person, and to believe in the Trinity is to commit the unpardonable sin of associating partners with Allah.

The doctrine of the Trinity does not imply that Christians believe in multiple gods; rather, it articulates the complex unity of the one true God in three persons: the Father, the Son, and the Holy Spirit. This understanding is rooted in Scripture, where Jesus is identified as divine. For instance, John 1:1 states, 'In the beginning was the Word, and the Word was with God, and the Word was God.' This verse establishes the pre-existence and divinity of Christ, aligning with the Christian belief that Jesus is fully God and fully man. Furthermore, Jesus Himself claimed divinity in various passages, such as John 10:30, where He states, 'I and the Father are one.' This claim was understood by His contemporaries as a declaration of equality with God, which led to accusations of blasphemy. The Christian understanding of Jesus' nature does not detract from the oneness of God but reveals a deeper complexity within that oneness, as articulated in the New Testament. Additionally, the concept of the Trinity is not a contradiction to monotheism but a fulfillment of it. The early Church grappled with these theological truths, leading to the formulation of the Nicene Creed, which affirms belief in one God in three persons. This understanding is consistent with the biblical narrative and does not violate the core tenet of monotheism as understood in Christianity.