Previous threads tried to address this opposition by saying that Christianity was all rational and Islam is irrational.
People must have a certain element of Faith to believe in each and no one can definitively prove who is correct. I suppose the better question who has the faith that is most believable.
Mohammed began preaching a peaceful Islam in Mecca, but was thrown out of Mecca and went to Medina. In Medina he gained a large following and an Army. Once he had power, Islam changed and became violent to outsiders. He killed and murdered unbelievers, and forced people who did not bend to his will to accept dhimmitude status (submissive) status and pay a Jizya (tax to the muslims). Mohammed also, claimed that all words from God were corrupted over time and that he had the true revelation. Mohammed became powerful, rich, and had many wifes (more than other muslims are allowed by the way).
From Islamic history none the less, Mohammed seems to have changed his story once he got power, He could not support his claims with history, so he just stated all other books were corrupted. This is a common way to avoid providing evidence for ones belief. He became rich and powerful, so he most certainly had secondary gain. Lastly, he did no die a prophets death. He died of old age. He certainly appears to have used his claim to be a prophet for personal gain.