The idea of #Namor being a god likely isn’t meant to be taken literally. However, it can serve to add to his character by exploring the historical context of the terminology. Mesoamerican culture is likely going to be a big part of Namor’s character.
First & foremost, what needs to be discussed is what the Feathered Serpent God is supposed to be. The Feathered Serpent was a prominent figure in Mesoamerican religions, with all versions being some sort of winged serpent with ties to the sky and weather.
With #Namor being treated as a god because of his mutation, it sets up a precedent for mutants in the MCU being treated as diving beings by different cultures, & that can work to explain why they haven’t been part of the MCU until recently.
Dragons don’t easily allow new riders to claim them, especially dragons like Vhagar who are nearly 200 years old, have known several riders, and have spent many stretches of their lives roaming freely.
Before Aemond, Vhagar was ridden by Queen Visenya (Aegon the Conqueror’s sister-wife & the wielder of Daemon's sword Dark Sister), Viserys & Daemon’s father Prince Baelon Targaryen, & Laena Velaryon, each of whom had to prove their bravery in order to claim her. #HouseOfTheDragon