Hello Faith.
They can't be. They do not teach the same thing and they do not have the same name and one is the Father of the Son of God and the other is specifally said to have no son.
True, the three Abrahamic religions are not exactly alike, but they do share many similarites:
1) The belief that there exists one God
2) This God initiated a covenent with humans to or through a prophet
3) This God gave to humans an "outline" of proper worship, ethical behavior, etc.
4) The belief in or employment of eschatology, doctrines concerning the end of the world.
I also believe that because different names are employed for the same being doesn't presuppose difference. Allah has roughly ninety-nine names that are used in the muslim tradition.
Yes they claim this but they also specifically deny what Jews and Christians believe about God so their claim is empty.
I disagree.
Religions of the World writes:
Islam respects the Scriptures of the Jews and Christians, but the Qur'an is understood to be God's
final message.
My bold.
Judaism and Xianity "built the foundation", and Islam sees itself as the final piece of the puzzle.