Many religions are based on ancient fact - Christians (and others) believe Jesus of Nazareth roamed Israel 2000 years ago, Islam is based on the writings of Mohammed. It's no stretch to assume that the unspeakably ancient writings of the Lords of Kobol were at least part of the basis of the Colonial religion. Myth is often based on some kernel of truth, after all.
Larson's genius in this regard was the blending of various influences and philosophies into the Colonial faith structure. In Judeo-Christian thinking, we become angels in the next life. The BOL are, in the BSG universe, angels - he made that reference. I'm actually kind of sorry there wasn't greater exploration of the religion during the run; I expect we'd learn that it was the same as ours (and as it is in Richard's books, that the BOL is the next step in human spiritual evolution) - you know what I mean.
Yet another casualty of ABC's rush, I guess.
I am
Dawg