How to destroy all religious beliefs

Find an alien. You know, one from space and stuff. As far as I know (and i'd love to be corrected) no religious text mentions beings from outer-space. If a martian rocks up on earth how the hell could the omission from every religious text be explained? Did they forget to ...
Original article from http://migrantroo.com/2006/06/10/how-to-destroy-all-religious-beliefs/