To suggest the Prophet Mohammed is fake is more ridiculous then saying Jesus is fake.
Also to my knowledge the Prophet did not have divine powers such are turning water into wine or curing blindness.(If he did please correct me).
Mohammed lived to an old age where is his religion become a major force. He was well known by the Byzantines and the Sassanid Empire and his descendents (family and friends) shaped the World from Spain to Pakistan for 100's of years after.
Jesus on the other hand was more of a preacher and gave a message and was killed and frankly to the Roman rulers was nothing important. That is way there is such lacking evidence.
Also I have not met a person who thinks either was fake, of course many object that Jesus was divine or was the son of God which is understandable.
