Some may think Christianity and Islam are both sourced from the same God, and they both lead to him. Is this belief true? If it were true, then their teachings on major doctrinal and ethical issues should be identical. A close examination shows conclusively that, although there are similarities, their teachings on key doctrinal and ethical issues are widely divergent and contradictory.
Here are some controversial differences between Islam and Christianity:
1. Islam disagree the idea that Jesus Christ was crucified on the cross. They believe that God spared His messenger from such an ignominious death and later took Him up to Himself. For Christians, the death of Jesus Christ on the cross is the focal point of all that they believe. The only way for man to be reconciled to a Holy God is for the ultimate price to be paid. Christians believe that Jesus Christ paid the ultimate price by shedding His blood. Without that precious act, Christians remain hopeless and in sin. In fact, the law requires that nearly everything be cleansed with blood, and without the shedding of blood there is no forgiveness
2. The religion of Islam has the Qur’an as the source of truth. Muslims believe that the original New Testament, which they call Injil, was the original revelation that Jesus received from Allah. They believe, however, that the Christians of today have corrupted the original Scriptures; therefore the Bible that is read by Christendom today is unreliable. Muslims believe that the message of Muhammad continued the original truths that were outlined in the Injil, and additionally, have corrected the errors that Christians have added. Christians hold that the Bible, including the Old and New Testaments is the infallible Word of God. They believe that God inspired the Scriptures; it is their only source of truth and instruction. For prophecy never had its origin in the will of man, but men spoke from God as they were carried along by the Holy Spirit
3. Muslims do not hold to any assurance of salvation. They do not feel that is was even necessary for Jesus to pay for our sins. The belief that they hold is that every man must bear and pay for his or her own sins; for Jesus to be punished and responsible for our sins would be unjust in their eyes. Christians believe that man had no ability to atone for his sins. Christians believe that we are hopelessly lost except for the immeasurable gift of God’s grace, which is the only means of salvation. For it is by grace you have been saved, through faith — and this not from yourselves, it is the gift of God.
4. Again, the difference is that of the cross and the sword. That’s why Jesus and His followers never established the death penalty for leaving the faith. Muhammad established it once he assumed military dominance. And the death penalty for apostasy from Islam remains in force in a number of Islamic countries today. Muhammad beheaded some of his enemies. Jesus forbade His followers from taking up the sword in His defense. The differences are glaring and clear.
5. Muhammad recited, “I do not know what will be done to me or to you” (46:9). Therefore, Muslim’s have no certainity they will go to heaven. But jesus said “In my Father’s house are many mansions: if it were not so, I would have told you. I go to prepare a place for you. And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also.”
6. Islam beliefs Jesus was the son of virgin Mary and a prophet but not the son of God. It also beliefs that Jesus wasn’t crucified. Someone was substituted for Jesus and he hid until he could meet with the disciples. Islam also holds sin as disobedience to the established law. They belief sin does not grieve Allah. Christianity beliefs Jesus is the divine son of God born by virgin Mary. He died to make atonement for the sin of humanity. And sin is rebellion against God. Sin grieves God.
7. Christianity sees man as created by God and in God’s image,but has a sinful nature whereas Islam said man is created by Allah and man is sinless.
8. Muslims belief Quran is a later revelation that supersedes and corrects errors in the Bible while Christians don’t accept Quran as divine revelation.
9. Finally, angels are divine Messengers created from light and are not worshipped. Satan is an angel though created by Allah but Bible defined angels as heavenly servants of God who acts as His messengers
Olakunle Isaac 
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