Though many ancient religions initially affirmed the monotheistic concept of God, it is unfortunately true that this concept of unity did not get perfection in those religions due to their polytheistic practices. Thus, monotheism was replaced by polytheism at maximum religious beliefs and practices in the course of time. However, of Abrahamic religions both Judaism and Islam strictly maintain monotheism by their uncompromised and unqualified concept of the unity of God. As far as monotheism is concerned, though there is apparently no difference between these two faiths, but internally there are some subtle differences. In spite of it, the monotheistic concept is the most common point of all similarities prevailed in both traditions which can surely pave the way to build up a close and harmonious relationship between Jews and Muslims which is at present more essential than ever before.