The third part only focuses on the monetary system. Christian origins & 9/11 are parts 1 and 2.
I agree with a great deal on the origin of religion, but I'm skeptical about 9/11 being a conspiracy.
Part 3, along with the subsequent film "Zeitgeist: Addendum" (http://www.zeitgeistmovie.com/) have spawned a global movement for change. Any monetary system has profound flaws which lead to poverty, crime and hinder human progress.
This Zeitgeist Movement is the activist arm of The Venus Project, which promotes a resource-based economy. The project site (http://www.thevenusproject.com/) outlines how future cities would be designed and how Earth's resources would be shared globally--without the use of a monetary system.
You can learn more about the Zeitgeist Movement here: http://www.thezeitgeistmovement.com.
The Venus Project is here: http://www.thevenusproject.com/.