I think you are being down-voted because others have pointed out this is a venture by the Crown Prince of Saudi Arabia, so it will most definitely not be Secular humanism or anything close to it.
https://www.psychologytoday.com/blog/the-secular-life/201410...
But I was not here to argue that. If this new "nation" wishes to be forward-thinking and open-mind-inviting, it needs to shake off the religion requirement.