This is certainly true of orthodox (not just Orthodox) Christianity. But an old, and formerly very powerful Chrisian heresey -- Arianism, agrees with Islam on this. Started by the Byzantine Bishop Arius, it was very popular in the Eastern Roman Empire during the 4th century, then was successfully fought by mainline Christians, led by the Pope of Rome, among others.
The great Church Council at Nicea, presided over by the Emperor Constantine had as a main purpose the making of a decision on the divinity of Christ. It produced the Nicene Creed, which virtually all Christians accept today ('True God and True Man'). The heresy was destroyed in the Empire. Unfortunately many of the German tribes, including the East and West Goths, and the Franks were converted by Arian missionaries in the meantime. When they took control of the provinces of the Western Empire, they actively persecuted Christians who accepted the Creed.
Eventually they all converted to mainline Christianity, but much damage had been done to the fabric of society, and Spain was so weakened, since Arianism was not eliminated until the 6th century, that its defeat by the Moors was made much easier.
In a sense, then, Islam could be considered to be a heresy of Christian Arianism.
Jesus Christ actually lived in history, was put to death on the cross, and rose from the tomb three days later to minister and instruct his disciples. That was the straightforward testimony of the brave and simple men who were his disciples, the testimony for which they were willing to die cruel deaths.
Islam denounces all of this as a vile heresy, condmens it as bald fiction, and calls for the death of any Muslim who would profess a belief in it.
Islam is antichrist.