The Muslim "Allah" is not God the Father. The Muslim "Allah" is not the Holy Trinity (Father, Son and Holy Spirit - "one God in 3 persons and 3 persons in one God" from the Athanasian Creed). Islam strictly and overtly denies the Trinity. Islam does not teach Christ as the Lord and Savior:
Whoever transgresses and does not abide in the doctrine of Christ does not have God. He who abides in the doctrine of Christ has both the Father and the Son. If anyone comes to you and does not bring this doctrine, do not receive him into your house nor greet him; for he who greets him shares in his evil deeds. 2 John 1:9-11
Based on this passage alone, Islam is a false religion. The Muslim Allah is a false god. There is no salvation in Islam, only eternal damnation. Islam is a religion of work righteousness - you must lead a holy and pious life to earn your "salvation". Islam denies the free and full atonement for our sins won through Christ's death and resurrection.
Islam is a false religion that worships a false god - rank idolatry in God's eyes.
A Lutheran