Ram or God?
The Ram is the symbol of the sign of Aries and carries with it meanings of spring, new growth, passion and the enjoyment of physical strength and growth.
Aries or Mars, whatever name you wish to use, is (in myth and legend) the God of War. Astrologers attribute anger, fighting, war, the bringing of blood and heat, and one having bravery.
While the golden fleece comes from the Ram, the taker of the fleece is the man-God. In terms of the story, both are required as the prize is worth the effort, and the effort deserves the prize. So, can the story serve various needs and ends? Or, once the story is over, does the Ram and the fleece continue in their way, time, and place while the man-God continues within his myths and his own existence--whatever it may be?
They are entwined only within the story IMHO.
If you step back and consider what Astrology is, what the Tarot is, what the Tree of Life is you will likely see that each is their own system of knowledge, study, understanding. Mixing one with another is not a smooth, perhaps not even a rough process. Instead, it may only be a casual possibility when one adds or highlights a meaning in the other system for the purposes of comparison and as a memory aid. Dave