The argument over this is stupid. Mohammedans believe they worship the “God of Abraham”, the one true God. So do Christians and Jews. Maybe they get it wrong. Maybe Baptists have it wrong, or Catholics, or all of them. How do you know who is worshiping the “Correct” god in the correct manner? The Bible says? The Koran says? The Torah says? They each say the other’s book is wrong. Give it up. It is a matter of faith. We believe what we believe.
How can anyone PROVE that someone who claims that the God he worships is different from the God someone else worships? The Christian quotes the Bible, the Mohammedan quotes the Koran and both think they have won the argument because his book is proof and the other is a lie. The reality is, no one will know until they go to meet their maker. Until then, believe what you like and hope you have got it right.
Easy.
The God of the Bible tells us to love our enemies.
The god of the Koran tells his followers to kill their enemies.
Clearly different.
Christians believe Jesus is the Son of God, who was Ressurected from the dead, and by his sacrifice on the cross our sin is removed and we may enter the Kingdom of Heaven.
Muslims go out of their way to deny the sonship and divinity of Jesus Christ. It is even written on the Dome of the Rock (mocking Christ's divinity). Muslims do not believe He rose from the dead, and don't believe in His redemption.
The Jews are still the apple of God's eye and His chosen people, and during the coming Tribulation the nation of Israel will be saved. Christians are grafted onto the vine through the Messiah.
This rock formation is on the Dome of the Rock. It looks to me like Satan, and that is what I believe Satan put there, because Islam is the worship of Satan.

Christians believe God has a son. Muslims believe God has no sun.
Christians believe God is triune (one being, three persons). Muslims believe God is unitarian (one being, one person).
How do you prove they're different? You look at their attributes. They're different. QED.
“allah” declared war on God and His Judeo/Christian followers
“allah” = satan
It’s not rocket science when you examine the base core
islam is a leftwing totalitarian political movement with same goals as leftwing totalitarian Communism
islam has its’ own legal system (sharia) that rejects God’s Torah
islam is pure satanism...and demonstrates that evil everyday.