I know; what I got across from your post is that you believe Mohammed is given some reputation as 'untouchable' by western writers due to a supposed Islamic Sympathy? Or perhaps that was my imagination.
True; but the expansion of Christanity was not a
military event unlike Islam. Europe did not turn Christian under a force of arms; unlike say, Iran. In the Koran Mohammed leads conquests which almost certainly did occur; plotting the historical movements of troops on the globe is much easier to decipher than the early history of what was, an underground and much persecuted sect.
I don't think my worldview is particularly commendable. All I report is how I perceive it (or at least I try to), bring other factors into it without skepticism just leads to worst kinds of absolutism. How can we judge one person's opinion on a nebelous human concept - 'religion', 'ethics', 'morality', etc - over another if both people are use external and unprovable forces such as god as justification.