Kia ora Moses
Hehehe. Sitchen is a great writer but also one who takes great liberties in interpretation, ie what he has researched and commented on is often used to push preconceived ideas in my opinion. Von Daniken is another who springs to mind.
Having said that there are others who while dealing with the same subjects take a more down to Earth approach, dealing with facts and leaving the interpretation up to the reader
There are many mysteries in the World, and if it hadn't been for the religionists penchant for book-burning, we might have had a lot of answers! Likewise if the Powers that be were more open rather then maintaining their own mythology we could all much further ahead, tho given recalcitrant, murderous nature of man this is wide open to debate
Much is still to be found, but nationalistic ego's prevent examination of the areas where "civilisation" had its birth place. Have a look at this and scratch your head!
http://tinyurl.com/6nxlgk
Click on any of these images and look at the scale of things!