I'm confused on why you copy the information from their website, which says a photocopy of the birth certificate is acceptable, and then tell people you can't use it? Then you attack/name call the people that read the website and understand it correctly.
We sail with a copy of sons' birth certificates rather than the original, because I dont mind losing a $.25 piece of paper if something bad happened to my paperwork. They are younger than 10, so we don't even an ID for them.