For what its worth, I agree with him. Read the whole thing here.
Without descending to details, such as the difference in treatment accorded [by Mohammed] to those who have the "Book" and the "infidels," he turns to his interlocutor somewhat brusquely with the central question on the relationship between religion and violence in general, in these words: "Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached."
The emperor goes on to explain in detail the reasons why spreading the faith through violence is something unreasonable. Violence is incompatible with the nature of God and the nature of the soul. "God is not pleased by blood, and not acting reasonably ("syn logo") is contrary to God's nature. Faith is born of the soul, not the body. Whoever would lead someone to faith needs the ability to speak well and to reason properly, without violence and threats.... To convince a reasonable soul, one does not need a strong arm, or weapons of any kind, or any other means of threatening a person with death...."
The decisive statement in this argument against violent conversion is this: Not to act in accordance with reason is contrary to God's nature. The editor, Theodore Khoury, observes: For the emperor, as a Byzantine shaped by Greek philosophy, this statement is self-evident. But for Muslim teaching, God is absolutely transcendent. His will is not bound up with any of our categories, even that of rationality....
As far as understanding of God and thus the concrete practice of religion is concerned, we find ourselves faced with a dilemma which nowadays challenges us directly. Is the conviction that acting unreasonably contradicts God's nature merely a Greek idea, or is it always and intrinsically true?
I believe that here we can see the profound harmony between what is Greek in the best sense of the word and the biblical understanding of faith in God. Modifying the first verse of the Book of Genesis, John began the prologue of his Gospel with the words: "In the beginning was the 'logos.'"
This is the very word used by the emperor: God acts with logos. Logos means both reason and word -- a reason which is creative and capable of self-communication, precisely as reason.