Christian beliefs hold that any other teaching besides that of salvation through faith in the “Son of God, Jesus Christ” is worshiping false gods/idols.
Islam does not believe Jesus (Isa) is the Son of the living God. They instead believe he “was” a good teacher, a prophet.
If Jesus was a good teacher only....he'd also be a liar. Perhaps a stark raving lunatic, delusional.
The bible is a collection of first hand accounts of the prophecies leading to Jesus’s life, the accounts of His teachings and the miraculous events leading to our salvation through our Lord and Savior, Messiah Jesus.
We are not to embrace Islam as Christians. To elevate Mohammad and or Allah as deity above Jesus is to flirt with God's judgment/wrath.
Scripture is full of accounts of disciples, early church followers being slain in very cruel/evil ways by the government for denying the deity of idols, false gods.
This is of the father of lies...plain and simple.
If you condemn murder you condemn Mohammed.
If you condemn thievery you condemn Mohammed.
If you condemn rape you condemn Mohammed.
If you condemn pedophilia you condemn Mohammed.
If you condemn terrorism you condemn Mohammed.
If you condemn Mohammed you condemn Islam.
What can you expect from a Harvard prof?