You have to keep coming back after completing story planets.
I should warn you, after the Citadel, most side missions are really just more of a chore than being any fun or plot interesting.
Another book is coming out soon, Contact Harvest. There's two comics the graphic novel anthology and Uprising.
I'll be getting Halo 3 tomorrow straight after school. Going over a friends house to play some nice 4 player co-op.
Frankly my dear, I don't give a damn. If I can blow up cool shit with other cool shit and do this shit with some shit in the air and shit and all this shit exploding with a bunch of shit everywhere well...shit. Awesome.
Nowhere does the site claim anything about Christianity being true or even God existing. It's simply fleshing out the Bible using scientific methods and how these things couldn't have ever happened because they're physically impossible. There is no backing of religious dogma.
I always saw the Dollars trilogy as an anagram of what the Old West myth and legends were. The era of time was never stated because it didn't really matter.