Allah (Subhanahu Wa Ta'ala) the God of All Prophets

Then the Qur'an confirms that Allah (Subhanahu Wa Ta'ala) is the god of Abraham, Moses, Jesus and all other prophets:

And who forsakes the religion of Abraham except he who befools himself. Verily we chose him in the world and in the hereafter he is among the righteous. When his lord said unto him: surrender! He said: i have surrendered to the lord of the worlds. The same did Abraham enjoin upon his sons and Jacob as well saying: O my sons! Allah has chosen for you the (true) religion; therefore die not except as Muslims. Or were you present when death approached Jacob, when he said to his children: what will you worship after me? They said: we shall worship your god the god of your fathers Abraham, and Ishmael and Isaac one god and unto him we have surrendered.( 2:130-133 )

And as if the Qur'an knows before hand the attitude of Jews and Christians, so it answers their claims as follows:

And they say: be Jews or Christians then you will be rightly guided. Say: no, but the religion of Abraham, the upright and he was not of the idolaters. Say: we believe in Allah and that which has been revealed to us and that which was revealed to Abraham, and Ishmael, and Isaac and Jacob and the tribes and that which was given to Moses and Jesus, and that which was granted to the prophets from their lord. We make no distinction between any of them, and unto him we have surrendered. So if they believe in the like of that which you believe in, then they are rightly guided; but if they turn away, then they are in schism, and Allah will suffice you (for defense) against them. He is the hearer, the knower.( 2:135-137 )

Having clarified all this we proceed with the Qur'an in identifying Allah (Subhanahu Wa Ta'ala), chapter three starts as follows:

A. L. M., Allah, there is no god save him, the alive, the eternal. He has revealed unto you (Muhammad) the book with truth; confirming that which was revealed before it even as he revealed the torah and the gospel before that as a guidance to mankind and has revealed the criterion (the Qur'an). Those who disbelieve in the revelations of Allah theirs will be a severe doom. For Allah is mighty, and able to requite.( 3:1-4 )

Telling us more about Allah (Subhanahu Wa Ta'ala), the Qur'an says:

Nothing in the earth and the heavens is hidden from Allah. He it is who fashions you in the wombs as he pleases. There is no god save him, the almighty, the wise.( 3:5-6 )

Allah (Subhanahu Wa Ta'ala) himself testifies to this categorical truth, the truth of all truths:

Allah is witness that there is no god save him, and the angels, and those having knowledge. Maintaining his creation in justice; there is no god except he, the almighty, the wise.( 3:18 )

The Qur'an then reveals more about Allah (Subhanahu Wa Ta'ala) when it says:

It is Allah who splits grains and date stones. He brings forth the living from the dead, and is the bringer of the dead from the living. That is Allah. How then are you perverted? He is the cleaver of day break, and he has appointed night for stillness and habitation and the sun and the moon for reckoning. That is the measuring of the mighty, the wise.( 6:96-97 )

All the blessings of life emanate from Allah (Subhanahu Wa Ta'ala):

And he it is who has set for you the stars so that you may be guided by them amid darknesses of land and sea. Thus we have detailed the revelations to people who have knowledge. And it is he who has produced you from a single being, then part of it is a habitation and part is a repository. We have detailed the signs for people who understand. And he it is who sends down water from the sky, and therewith we bring forth buds of every kind...etc. ( 6:98-100 )

The originator of heavens and earth. How can he have a son; and he has no consort; but he created all things and is aware of all things. Such is Allah, your lord. There is no god except he, the creator of all things so worship him and he is the care-taker of all things. Vision comprehends him not; but he comprehends all vision; he is the Subtile, the Aware. ( 6:102-104 )

Source: Muslim World League - Canadian Office