Sir Thomas Walker Arnold (1864–1930) was a British orientalist and historian of Islamic art who taught at Aligarh Muslim University. He says in his book “The Preaching of Islam”:
“Islam is a religion that is essentially rationalistic in the widest sense of this term considered etymologically and historically….”
“The teachings of the Prophet, the Quran has invariably kept its place as the fundamental starting point, and the dogma of unity of God has always been proclaimed therein with a grandeur and majesty, an invariable purity and with a note of sure conviction, which it is hard to find surpassed outside the pale of Islam….”
“A creed so precise, so stripped of all theological complexities and consequently so accessible to the ordinary understanding might be expected to possess and does indeed possess a marvelous power of winning its way into the consciences of men“.
Read more to know about the great non muslims who have praised Islam and Prophet Muhammad.