3 – Key Islamic Views On God And The Trinity: Tawhid (Absolute Oneness Of God) This Is The Most Crucial Belief In Islam. The Foundational Declaration, The Shahada States, ” I Testify That There Is No god But Allah, And Muhammad Is The Messenger Of Allah”. REJECTION OF THE TRINITY: The Quran Asserts That Those Who Believe In A Trinity Have Fallen Into Disbelief. The Concept Of God Being Composed Of Three Persons Is Considered Idolatry And Goes Against The Core Principle Of Monotheism