But The part of the country taht matter, The capital and more important cities, population centerville, institutions and Official religiond áre full inithw western cultural orbital, The fact The countriside Is not still fully westernized Is irrelevant, you don't govern from The countriside you do it from The cities.
The sincretism Is a form of westernized, and Even in Europe Today youbhave important humano groups that have "culturally insignificant trappings of modern society" and still their host Countries áre fully considered westernized.
Ok I will need the source on that because by the latest mexican sources, the INEGI, only 7.500.000 people speak a Native language or if you prefer less than The 7% of the mexican Population, and by the same source only about a million don't speak Spanish, o less than 1% of the population, not several millions as you Say, The USA have a bigger proportion of his population that don't speak English
Anyways None of your arguments áre enough to explain why you Considere that México to their Independence date Is not a westernized country