His readiness to undergo persecutions for his beliefs, the high moral character of the men who believed in him and looked up to him as leader, and the greatness of his ultimate achievement - all argue his fundamental integrity. To suppose Muhammad an impostor raises more problems than it solves. Moreover, none of the great figures of history is so poorly appreciated in the West as Muhammad.
Indeed, right is with us and in us, and there is no one else who says this but that he is a liar and an impostor.
The most horrible wickedness and cruelties, and the greatest miseries that have troubled the human race began with this thing called revelation, or revealed religion. … It would be far, far better for us to let a thousand devils roam the world, and publicly preach the doctrine of devils (if there were such a thing, which there isn't), than to let one impostor and monster such a Moses, Joshua, Samuel or the Bible prophets come speaking the so-called word of God, and causing men to believe it.thomas paine