Belief in Aryanism did not originate with the Nazis. He stated:
"I am therefore the first to recognize that the Semitic race, compared to the Indo-European race, truly represents an inferior combination of human nature." —
Arvidsson, Stefan (2006).
Aryan Idols: Indo-European Mythology as Ideology and Science. University of Chicago Press, p. 107
You can wikipedia it to understand the bare basics:
https://en.wikipedia.org/wiki/Ernest_Renan#Life_of_Jesus
https://en.wikipedia.org/wiki/Aryan_race
And, also, you can read a little of
The Aryan Jesus:
https://books.google.com/books?id=8...Qez#v=onepage&q=for renan by contrast&f=false
Start with "Renan, by contrast" and read on to see his views on Jesus transforming Himself into an Aryan. You're right. Renan wasn't a Nazi. He was a proto-Nazi.
I am also waiting for your response to the historical corrections to your OP I made earlier.