Is Christian God and Muslim Allah identical??,(reply>), thank you for your insightful, helpful explanation/perspective.,(reply>), Yes and no. Both Christianity and Islam believe in one God, but the concept and understanding of God in both religions may differ. For example, Muslims believe that Allah is the one and only God, and that He is the creator and sustainer of the universe. Christians, on the other hand, God is often referred to as the Trinity, which is the belief that God is three persons in one being; the Father, the Son, and the Holy Spirit.