Islam and its founder

There is no doubt that one of the most divisive platforms of conflict today is Islam, or better to say, the way various people understand what Islam is and how they use that understanding to guide their actions. This is not a secret. Consequently, I have been studying various sources to learn more about Islam and also about Islam's founder, Prophet Muhammad (pbuh, I use "pbuh" out of respect for my brothers and sisters for whom that is important).   

I found many sources and decided to share two with very extreme views here. Here's one source:

Why We Are Afraid, A 1400 Year Secret, by Dr Bill Warner

It is a bizarre collection of insinuations that is hardly believable; however, judging by the number of views--1,942,642 as of now--it finds its audience. I do not wish to promote it, but in the interest of informing--there it is.

I heavily lean towards the views offered in the following documentary: 

Muhammad's life - documentary part