[count-your-change]

Doctrine in the required sense? what sense and required of whom/by whom? The Greeks had a “systematic theology”.
Father of the god and goddesses, a patron god for every aspect of human experience from drunkenness to war to childbirth. each of the gods or demigods had personality and at times were involved with other gods with varying degrees of power. and on and on.

Any library can provide all the books you'll ever need on Greek or Babylonian systems of theology in their respective religions.

Are they comparable to the light of Christianity? No, of course not, they are the darkness of demon worship Paul spoke of at I Cor. 10:20 and 2 Cor. 6:14.

[maryz]

The Greeks had a “systematic theology”.

They had stories IMO. However elaborate the stories grew, they didn't become theology.