Its an historical fact that Allah was the name of a pagan god.
How could the GOD of the universe allow people to call him a pagan name?
Some Christian versions of the Bible have inserted Allah as a name for GOD. This delusion was promoted in the 8th century thanks to the Catholic church.
If Allah were merely the generic Arabic word for GOD, then Muslims would not hesitate to use the word for GOD in each language into which the Koran has been translated. However, they insist that Allah be used in every language.
If you simply read the words of Jesus on the 8th chapter of John it becomes clear that Islam is a false religion.