Allah is usually thought to mean “the god” (al-ilah) in Arabic and is probably cognate with rather than derived from the Aramaic Alaha. All Muslims and most Christians acknowledge that they believe in the same god even though their understandings differ.
Similarly one may ask, do Muslims believe in the Bible?
Belief in the Books of God: Muslims believe that God revealed holy books or scriptures to a number of God’s messengers. These include the Quran (given to Muhammad), the Torah (given to Moses), the Gospel (given to Jesus), the Psalms (given to David), and the Scrolls (given to Abraham).
In this way, why do Christians call God Allah?
Christians can do this because they believe that the God and Father of Jesus Christ is the God of all nations and cultures, not simply a tribal deity, and he has revealed himself in every human context and heart — including within other religions.