Nietzsche’s argument doesn’t rest on assuming he’s infallible.
No, let me tell you how the modern era of philosophy came about. So Sir Tylor was the founder of modern anthropology, he came about when the Europeans really started looking into the culture and religion of the Africans they were colonizing. He came along and said "Wow these people are so primitive they must be exactly like our caveman ancestors." Thus he came up with a theory of religious-moral progression, in that all people as they evolve believe in the same morals and have the same religion at the same part of their evolutionary progress. Thus he concluded that all religions and morals were false and just a product of natural evolution within the species. The whole point of Nietzsche was to come along and said "Wait if God and morality are dead how do we live our lives now?" If you remove the assumed premise "God and morality are proven false." Then Nietzsche's whole philosophy becomes a thought exercise rather than an examination of reality.
And also yes we KNOW that Tylor's theory is bunk as we have a vast amount of archeological and anthropological evidence that people groups have developed different religions and moral systems at different times and orders .
@Null You seem really down. Let me give you some poetry to help you out.
For a different age I was born,
Every man has once said,
Where each was to honor sworn,
Rather to all this cowardice bred,
Thus for a gilded time we mourn,
Insisting such days forever dead
Yet of all the feelings ever known,
longing for a time not your own,
is when true cowardice is shown,
especially if dark the age is grown,
for like dawn light in black sown,
all darkness will be overthrown.
All darkness will be overthrown.
Instead one is given a great gift,
born in darkness and darkest days,
he’s given trials, mountains to lift,
Aye, the very minotaur in his maze,
he’s called to be strong, to be swift,
a hero upon which his sons gaze.
So appear you king or appear you slave,
among the good or a people strayed,
with actions now, the future pave,
for the coward is he who delayed,
product of his age, cradle to grave,
but an age makes not, it is man made.
It is man made.
"Man Made" by Mark Brahmin
and here is it in fashwave song form if you would like to play it.