Theology always comes from the streets, not from the skies above. It is formed by the people's lifestyles.
It then gives rise to a mass of superstitious beliefs and behavior.
This mass is then honed by preferred values, the need for law and order, and a process of elimination--what works and what doesn't.
Time steps in, until one can look back at one's theological history.
Scholars then study everything that has been formed and back it up with cross-references and footnotes.
Finally, the scholars feed back everything to the masses, reinforcing what they have been practicing so far.
...Problems arise when people change their lifestyles, and they usually do.