I was a member of the Baha'i Faith for a while. I later took a college course on Islam. To me, it seems that the Baha'i Faith could be considered a liberal off-shoot of Shi'ite Islam. It has similar laws, a fast, and obligatory prayers. The situation was also similar to what happened between Christianity and Judaism. The new "reforms" to the old religion made the Baha'i Faith a new and separate religion.
Another thought, when Islam started, Christianity was going in a direction that eventually led to Christians, themselves, breaking away from the traditional Church. What if Islam was a legitimate response to bad Christianity? It is easy to complain about Islam now, especially for Fundamental Christians. But there was no Fundamental Christianity when Islam started. So was Islam a reformation of wayward Christianity?
Something else, maybe radical Islam could be seen as a response to the bad in Western culture. Is there enough greed in what they see in our corporations? Is there enough schisms and in-fighting in our religions? If God is real, and they believe He spoke to them, then He should be the ruler, right? So why would they agree to separate church and state? Why would they want laws made by politicians over laws given to them by God?
Wow, it's a mess. There's plenty of room for some reform on all sides. Who's going to start?