So you think Muhammad was a good dude, that Muslims today are childish (like Christians of yore were childish), but I'm still not sure then what you think of the religion itself. I'm not trying to be asinine, I think I'm just missing your over-arching point here.
I'm not a fan of the religion (and honestly, not a huge fan of most organized religion). What Muhammad built is not what you see today. Just as Christianity has changed over the years, so has Islam but I believe for the worse.
This is not to say that probably the vast majority of Muslims aren't fine, upstanding citizens! I will not pass judgment on someone simply based on their faith, just as I expect that someone will not discount me because I do not subscribe to one religion or another. It is a person's actions that speak to who they really are.
As a whole though, the actions of Muslims, in the name of their faith (be it a twisted view or not) have not impressed me. Certainly it is a relatively small minority of Muslims who engage in these deplorable acts, but the vast majority do not seem to take an active role in protesting theses acts. The most fired up I have ever seem the Muslim world was over the Muhammad cartoons in a Danish newspaper. What's a bigger insult to a your religion? - a cartoon by a non-believer, or 20,000 chukleheads blowing themselves (and other Muslims) up in the name of their faith?
If Islam were practiced as Muhammad had originally taught then they would be the very beacon of civilization. Of course, the same could be said about a lot of Christians...
Clear as mud?