Why won’t they swear on the Bible

It blows my mind that not a single astronaut will put their hand on the Bible and swear that they walked on the moon. Why is that if I actually walked on the moon I would do it in a heartbeat to me that shows me two things first thing is that NASA liesand has their astronauts sign non-disclosure agreements and the second thing is that these astronauts or actornauts believe in God