If someone tries to make you decide between the information provided by Third Pillar in the Religion of Light, or what is revealed in Oahspe, remind them what Oahspe means.
The definition of Oahspe within the text itself is:
“Sky, earth (corpor) and spirit. The all; the sum of corporeal and spiritual knowledge as at present.”
So, the sum of all corporeal and spiritual knowledge at present (2017) is different than it was in 1882. There have been scientific discoveries and divine revelations, there has been the offering of Gnosis since the publication of the Oahspe (Scripture) in 1882.
From our perspective, Oahspe, is the sum of all corporeal and spiritual knowledge at present. For this reason, the Divine Knowledge revealed in the Religion of Light can never be at odds with Oahspe since that Divine Knowledge is part of Oahspe in the fullest sense.
My words regarding scientific discoveries would be related to the physical, sciences or technological developments since 1882.
Here is a list of just some of those discoveries:
The laws of chemical dynamics
The Third Law of Thermodynamics
The atomic nucleus
X Ray diffraction
The Model of the Atom
That the Milky Way is just one of many galaxies
Hubbles law of the expanding universe
The 4th Law of thermodynamics
That DNA is the genetic material of the chromosome
the Polio Vaccine
The Helical structure of DNA
The Big Bang Theory
the first pulsar
the first gamma ray burst
High temperature superconductivity
The Human Genome project
Synthetic genomes for a bacterial cell
Liquid discovered on Mars
Gravitational waves from a a black hole merger