To be factual, there are numerous stances of just that happening. That is at least arguably how the Shia/Sunni split arose, and also how Ahmadiyya Islaam and the Bahai Faith came to be. To say nothing of Buddhism, Jainism and Sikhism.
In my opinion, after living as a Sunni Muslim for over 7 years, the Prophet Muhammad PBUH did many fine things for Arab tribesmen (And women). He is known to be very moderate, no matter what they say about one of his wives, Aisha. He authored The Constitution of Medina, a groundbreaking document, and in it the first time rights for women were written down. In Kutbah, they all sat in a circular tent, men on one side and women on the other.
My major issue with Islam is their treatment of Isa PBUH (Jesus the Christ). Islam should allow a divergence of opinion around this issue. Instead, some sects say calling Isa a Son of Allah SWT is "Shirk", and the penalty for that is beheading. That is far too harsh in my opinion.
In stead, the fools kill each other over who should take over Islam when Muhammad PBUH died.
I ran into lots of tribalism that supplanted actual Islam.
Other than that in many ways I am still Muslim despite my saying I am a Radical Christian. Most of the Radical part of my belief is that I would fold Christianity, Islam and Judaism into one belief.