No no, that's TempleOS

" ... a biblical-themed lightweight operating system (OS) designed to be the Third Temple from the Hebrew Bible. It was created by American computer programmer Terry A. Davis, who developed it alone over the course of a decade after a series of manic episodes that he later described as a revelation from God."

https://en.wikipedia.org/wiki/TempleOS

Er..... wut?! :D

@pennomi here you go
https://linuxfromscratch.org/
Good luck!