Since you hold the new Testament books to not be, in your opinion, true, let’s ask you on what stand-alone basis do you hold that the book of Numbers is true?
https://www.biblegateway.com/passage/?search=Exodus%2020%3A2-17&version=NIV
and
https://www.biblegateway.com/passage/?search=Deuteronomy%204%3A32-35&version=NIV
And a bonus, a real proof-text:
https://www.biblegateway.com/passage/?search=Deuteronomy%2013%3A1-5&version=NIV