Words. Not fact.
Zoroaster, Buddha, Confucius all wrote their scriptures.
Do you believe them?
They had good things to say and much you will find in the Christian scriptures (only in other wording.) They also made some statements which were equally unprovable and in many cases (self delusional). It is up to the reader to determine what is good and what is not.
Christ is the only one I know of that got it just about as right as right could be. Some of his transcriptions through history may have diluted or deluded his preachings but most of it is reasonable, moral and would lead people to a good life.
Oh??
Based upon what?
What STANDARD are you using to make this judgement call?