In a nutshell I believe they ascribed human aspects to their understanding of nature. They meant everything they said literally.
Take two of their statement;
Osiris in his name of seker tows the earth by means of balance.
Tefnut makes the earth high under the sky by means of her arms.
I believe both of these mean the exact same thing seen from two different perspectives. The first is the perspective of the water that fills the counterweight. Osiris is the name of the water source and this water becomes seker in the counterweight (henu boat). In the counterweigh seker lifts the stones on the opposite side of the pyramid (he tows the earth).
Tefnut is their name for "gravity" or weight. All men affect the worldf through their arms so their understanding of gravity affect the world through "her" arms. "Gravity" (named tefnut) makes the earth (pyramid) high under the sky.
Modern language makes no allowance for perspective even though perspective is everything. Ancient language apparently always defined the perspective.
There are several fairly extensive threads on this subject. I believe the single most comprehensive post and thread are here;
There are a few things a little out of date but it's a good overview.
My contention is and has been ancient people invented this modern world and they did it with a different kind of science and used a different kind of language. It's impossible toinvent anything at all with beliefs and superstitions. Everything requires and has required science. There are no exceptions.