That's not the point brother.... Muslims consider Prophet Muhammad (P.B.U.H) as the final messenger so any claim to prophet-hood after that will not be entertained by Muslims.
I am aware of 'Amar bil Maroof wa nahi anil munkar', but it doesn't work like that..... First we need to focus on ourselves and build our own character so that when people listen to us talking/giving speeches they are attracted by what we have to say and it's not just about spreading the message, it's more about spreading it effectively to yield the best possible results. If we look at the life of Prophet Muhammad (P.B.U.H) when he started spreading the word of Islam, the people around him were Non-Muslims, but because He lead by example, His majestic qualities and impeccable character was so charming that people couldn't resist but to listen to Him and finally almost all of them reverted to Islam. He was known as 'Al-Sadiq, Al-Ameen', these qualities are very rare these days. Ofcourse, we cannot achieve the standard of Prophet's Character but we can strive and make ourselves as close as possible. So, it's more about building one's own character and then leading by example otherwise people don't really care about what the other person has to say..... that's my point, first focus on yourself and then by all means spread the message as effectively as possible and also make sure you don't offend anyone..... because people from the golden age of Islam were very conscious about converting people to Islam but unfortunately now adays it's the other way around.
I hope to have made myself more clear this time around. :)
