IMO this is like in the graphic novel Sandman and in The Shintoism, "gods" are everything worshiped by someone, so All primal are essentialy god,but like was said on MSQ what the people summon is not the true god, just the aspect of what they want from the god.
Ifrit,Garuda and Titan = Rage
Ramuh = Protect
Shiva = Kind of "Protect"
The King Thordan = Power
