Nevertheless, many of our Muslim friends only like to quote critical scholars when they're contradicting the Bible, not when they're contradicting the Qur’an. So let’s toss all of history aside and go wherever the Qur’an leads.
The Qur’an commands Christians to judge by the Gospel. Indeed, the Qur’an declares that we are rebels if we refuse to judge by the Gospel:
Qur’an 5:47—Let the people of the Gospel judge by what Allah hath revealed therein. If any do fail to judge by (the light of) what Allah hath revealed, they are (no better than) those who rebel.
So we open the Gospel and read about Jesus predicting his death by crucifixion:
Mark 10:32-34—They were on the road going up to Jerusalem, and Jesus was walking on ahead of them; and they were amazed, and those who followed were fearful. And again He took the twelve aside and began to tell them what was going to happen to Him, saying, “Behold, we are going up to Jerusalem, and the Son of Man will be delivered to the chief priests and the scribes; and they will condemn Him to death and will hand Him over to the Gentiles. They will mock Him and spit on Him, and scourge Him and kill Him, and three days later He will rise again.”
Obviously, since the Qur’an commands us to judge by the Gospel, and since the Gospel affirms Jesus’ death by crucifixion, we must conclude that Jesus died by crucifixion. Otherwise, we’re in rebellion against Allah.
So far, so good. But then we open the Qur’an and find that Jesus didn’t die by crucifixion at all. Instead, Allah simply tricked people into believing that Jesus died:
Qur’an 4:157-158—They said (in boast), “We killed Christ Jesus the son of Mary, the Messenger of Allah”—But they killed him not, nor crucified him, but so it was made to appear to them, and those who differ therein are full of doubts, with no (certain) knowledge, but only conjecture to follow, for of a surety they killed him not—Nay, Allah raised him up unto Himself; and Allah is Exalted in Power, Wise.
Here we’re commanded not to believe that Jesus died by crucifixion. So what should we believe? On the one hand, we can believe the Qur’an, which commands us to judge by the Gospel, and therefore commands us to believe that Jesus died by crucifixion. On the other hand, we can believe the Qur’an, which tells us that Jesus’ death on the cross was a hoax perpetrated by Allah.
Confused yet? Perhaps one of our Muslim readers can tell us whether we should agree with the Qur’an or with the Qur’an.