What if we did T20 Traveller and introduced the Cleric Class from D&D 3.5 and modified it for T20, basically alter the class skills and proficiency to be suitable for a Traveller setting, and also adjusted the spell list a bit as well. Instead of basing spells on wisdom, we use the T20 Psi score instead? Cleric spells are borrowed psionic powers, each cleric has a telepathic link to his or her deity, and through that link, a deity grants his or her cleric a clerical spell-like psionic power with properties identical to the cleric spell of the same name. No need for wizards or any other spell using classes, just clerics and in the case of Gaia - Druids. This should be interesting. Clerics would allow the game to be more combat intensive, one can recover stamina and lifeblood more quickly.
One interesting feature is that Clerics can use divination spells to communicate through their deities across interstellar distances, this ability would make clerics very powerful throughout the sector. There are range limitations, basically the deity's range is 1 sector, about 16 sub sectors, certain spells aren't available in a Traveller setting of course, no Alignment detection for example, no raising of the dead except for the recently deceased if the body is intact, no undead and no animate dead spells, it isn't really magic after all, its science, nothing to do with other planes of existance, the gods reside somewhere within the sector, no one knows for sure where they are, they can disguise themselves as humans or other creatures. Death and the afterlife is a mystery, the gods don't know anything about souls of other planes of existance, they are physical beings with psionic powers dwarfing those of ordinary humans, they are not human, though they often look it, this is a magic is science approach, the gods keep track of their clerics through telepathic links, Clerics are few in number and the gods chose who they are and who the grant powers to. Clerics are kind of like Jedi in the Star Wars universe, most people have never seen one.
As for what a god might look like, I like this picture:
https://images.app.goo.gl/4NZNogij74J66FNF8
And this is Aphrodite's mother:
https://images.app.goo.gl/6D6y4XpQ84FN6zaq6