Legal experts out there ...

Are these valid reasons to declare an oath invalid:
1- if the person taking an oath is an atheist or belongs to a non-Christian religion
2- if there is a page missing ???

Just a couple of days ago I saw a bunch of JPs sitting in a shopping center. A bible was part of their equipment. In a way it is strange to see just the bible in a secular country. Ans if they have the bible why not a whole collection of "holy" books and paraphernalia so people to swear on?
The majority in this area are not even bible fans.