Of course Muhammad was a Messenger of God. 22% of the world population are not just following "some guy."
Muhammad is one of the greatest Messengers who ever lived, along with Jesus, the Bab and Baha'u'llah...
More later, gotta run to work, I mean bike. I do not like being late, I prefer being early...
Oh wait, I just remembered. How do we know if someone is a Messenger of God, a Prophet?
“What then is the mission of the divine prophets? Their mission is the education and advancement of the world of humanity. They are the real teachers and educators, the universal instructors of mankind. If we wish to discover whether any one of these great souls or messengers was in reality a prophet of God we must investigate the facts surrounding His life and history; and the first point of our investigation will be the education He bestowed upon mankind. If He has been an educator, if He has really trained a nation or people, causing it to rise from the lowest depths of ignorance to the highest station of knowledge, then we are sure that He was a prophet. This is a plain and clear method of procedure, proof that is irrefutable. We do not need to seek after other proofs.” Bahá’í World Faith, p. 273
"if He has really trained a nation or people, causing it to rise from the lowest depths of ignorance to the highest station of knowledge, then we are sure that He was a prophet."
I guess Muhammad must be a Prophet.
Although I agree with others that numbers are not all important we need to consider that Islam is the fastest growing religion in the world and and set to overtake Christianity as the largest religion later on this century. What strikes me is how it has endured for over 1,400 years and adapted itself to so many different cultures.
The big question though is whether or not it will properly adapt to the modern world with rising standards of education and propserity.