I mostly agree with the other responses so far, but...
>>18150537 (OP)
>>18150584
>>18150627
There's no inherent "main" Aztec god, in part because "Aztec" can mean a dozen different things, and in part because even if you mean Mexica, there's no clear answer:
>Huitzliopotchli
+ Was the Mexica patron god
+ Had a shrine in the Great Temple
+ / - Not in most myths, though the myths he was in were very important to the Mexica
+ / - Has an average amount of festivals
- Wasn't depicted often in artwork
>Tlaloc
+ Had a shrine in the Great Temple
+ Featured in a ton of holidays/festivals
+ Is commonly depicted in art
- Isn't brought up much in myths of figures of speech
>Tezcatlipoca
+ Is in a lot of myths
+ Talked about as a supreme or omnipotent/present god (probably just a reflection of his associations with fate guiding all)
+ Is commonly depicted in art
- Didn't have a shrine in the Great Temple
- Only has one major festival
>Quetzalcoatl
+ Plays a major role in tons of myths
+ Extremely common in art
+ / - Has an average amount of festivals
+ / - Some of his importance may be due to post-contact revionism
- Didn't have a shrine in the Great Temple
>Ometeotl
- Probably didn't actually exist despite Portilla asserting they were a top omnipotent creator god
Personally i'd say Huitzilopochtli and Tezcatlipoca were the most important, followed by Tlaloc, followed by Quetzalcoatl, Xipe Totec, and some other major deities
>>18150681
I'd say patron god first, war god second, sun/fire god third