I've also noticed some Biblical references in Halo.
Taken from an article I'm working on for my blog:
I've noticed throughout the books and games that the Halo Universe has many parallels to the Christian Bible. And its not just me, several of my friends, people on the Halo Waypoint Forums, my mother (she read Ghosts of Onyx), and even David Ellis, content producer at 343i (at 32:40 of 343 Sparkast 006) all said they noticed Biblical references in Halo.
Before I go into all the references, I'm going to give a little conjecture. After reading Halo: Primordium many think that the Precursors created The Flood to punish the Forerunners for rising up against them. This is similar to how God was displeased with the humans' sin, and sent the Great Flood. But, we're not even sure this what happened, so don't quote me on this.
Ok, on to the rest. As I stated above, The Flood is similar to The Great Flood of the Bible. What else? The Ark. In Halo, what is The Ark's purpose? To protect the Forerunners, and samples of all other life from The Flood. Hmm... sounds familiar. Noah built an Ark to protect his family, and samples of all life from The Great Flood.