Judaism, Christianity, and Islam together make up the largest religious group in our present society. Even though these three sectors are ever at war we have to agree that their faith in their God is unshakeable and it is the driving force behind their conflicts other then territorial disputes.
Judaism which is the primary religion of the Jews and that of the country of Israel derived its doctrines from the prophet Moses and other prophets before Jesus. Their basic book is that of the Old Testament known among the Jews as the Torah; the five books of Moses. The concept of God among the Hebrews of Judaism is different from that of Christianity and different from that of Islam. It is this fundamental difference at the top of the hierarchy that is the driving forces of divisions among these three sectors.
The main difference between these three religions is who their God is. Judaism holds that the Hebrew Gods are seven known collectively as the Elohim, united to form one God. There are seven colors within the rainbow united as one forming a single white color. Among the Hebrew Gods, the God YHVH is supreme. Christianity has two perspectives of God, the perspective of who Jesus says God is and the perspective of who Christians says God is. Jesus being a Jew, has the same perspective of God as that of Judaism, God the father is YHVH, for he was raised according to the doctrine of the Torah. The perspective of the Christian is, Jesus is the son of God; the son and the father are one; therefore Jesus is God. So the Christians recognize a trinity of God the father, God the son, God the Holy Spirit; these three are united as one. In order words it is three primary colors of the rainbow colors of Red, Green, Blue united to form white light. Whereas Judaism is looking at it from the point of view of the seven colors of the rainbow, Red, Orange, Yellow, Green, Blue, Indigo, Violet united as one to form a single white light.
Now let us look at religion from the Islamic point of view. Islam believes that there is one God Allah and Muhammad is his prophet. So here it seems Islam is looking at the White light instead of the components within the white light. Their perspective is the unified God, whereas Judaism and Christianity are looking at the components within the white light. The God Allah of the Muslims is actually one of the seven Elohim of the Hebrews known as the God Eloah.
Allah is spelled in Arabic the same way as Eloah is spelled in Hebrew excerpt that Arabic pronounces it by the way it is spelled. In Hebrew the letter “E” is actually an “A” so Eloah when written becomes Aleph, Lamed, He, which is Allah. So why so much of the bickering when the God of the God of Christianity is the Hebrew God of Judaism, and the God of the Muslims is one of the Hebrew Gods of Judaism.
Basically both Christianity and Islam which came much later than Judaism are extensions of Judaism, derived from Judaism and are not essentially worshipping a different God as they think. When looking at white light, they are all looking at the Elohim, their way of practicing and worships may be different but essentially they all indirectly arrive at the same destination by different prophets.