Muslims, new converts in particular, should be cautious about issues of `Aqeedah (creed). They have to resort to reliable Muslim scholars to get themselves well-acquainted with the true belief.
It is a known fact that every language has one or more terms that are used in reference to God and sometimes to lesser deities. This is not the case with Allah. Allah is the personal name of the One true God. Nothing else can be called Allah. The term has no plural or gender. this shows its uniqueness when compared with the word god which can be made plural, gods, or feminine, goddess. It is interesting to notice that Allah is the personal name of God in Aramaic, the language of Jesus and a sister language of Arabic. The One true God is a reflection of the unique concept that Islam associates with God. To a Muslim, Allah is the Almighty, Creator and Sustainer of the universe, Who is similar to nothing and nothing is comparable to Him.
Dr. Muhammad Abu Laylah, professor of the Islamic Studies & Comparative Religions at Al-Azhar Univ. states: First of all, we should firmly believe that there is no god but the One and the Sole God, Allah. He is absolutely Omniscient. He is the Creator of everything and has sovereignty over everything. He isn’t restricted to time and space and nothing He created is similar to Him. He is One and Only. This is how the Muslims believe in Allah, but some people tend to shape God as they think about Him. The Prophets of Allah came to correct the human perception of the concept of God.
“God” is the basic of all religions, and how to describe “God” is a matter of differences and disputes among some people.
As to the Israeli conception of Yahweh, we see that they localized and nationalized “God” in a way that makes Him specific for them in order to lead them in war against enemies and to grant them privilege over others. However, we should say here that some liberal Jewish schools argue against the exclusiveness of the godhood and of the Israeli race saying that Yahweh or God in Judaism is the same God in which Muslims or Christians believe.
It goes without saying that any reader of the Old Testament will find many unfitting descriptions given to God.

Based on the above, it becomes crystal clear that a Muslim has to stick to the true belief of his religion and steer clear of any doubt that may tarnish his Islamic monotheism. It’s clear that Muslims believe in the same God as the God of Noah, the God of Moses, the God of Abraham and the God of Jesus, peace and blessings be upon them all, as well as all other prophets sent to guide the mankind. The Seal of all Prophets, Muhammad, peace and blessings be upon him, came to clean away all false associations filing people’s mind about God, and he established the pure religion of monotheism. So Islam asserts that “there is no god except Allah.