Who Is Allah
One of the biggest misconceptions that many non-Muslims have about Islam relates to the word "Allah." For various reasons, many people have come to believe that Muslims worship a different God than Christians and Jews. This is totally false, because "Allah" is simply the Arabic word for "God"—and there is only one God.
Let there be no doubt: Muslims worship the God of Noah, Abraham, Moses, David, and Jesus—peace be upon them all.
Nevertheless, Jews, Christians, and Muslims do hold different concepts of Almighty God. For example, Muslims—like Jews—reject the Christian doctrines of the Trinity and the Divine Incarnation. This, however, does not mean that each of these three religions worships a different God, because—as we have already said—there is only one true God.
Judaism, Christianity, and Islam all claim to be "Abrahamic faiths" and are all classified as "monotheistic." However, Islam teaches that other religions have, in one way or another, distorted a pure belief in Almighty God by neglecting His true teachings and mixing them with human-made ideas.
First, "Allah" is the same word that Arabic-speaking Christians and Jews use for God. If you pick up an Arabic Bible, you will see the word "Allah" being used where "God" is used in English. This is because "Allah" is the Arabic equivalent of the English word "God" with a capital "G.
“Yet if you ask a Roman Catholic or a Greek Orthodox person whether God is one, they will invariably answer: "Yes!" This claim, however, does not stop them from being labeled "creature-worshipping" idolaters by some. The same can be said of Hindus, who consider their gods to be "manifestations" or "incarnations" of the one supreme God.