You don't have to disbelieve in gravity to believe that you can fly. People fly with aids while believing in gravity. Birds and insects fly and experience, believe in, and count on gravity. However, most people do not believe human can fly like birds, i.e. on their own volition with their physical facilities.
If you can fly, you need to believe in gravity to land. You also likely imagine flying in the context of having Earth gravity rather than floating in space.
Last edited by Zenn; 10-13-2011 at 05:17 AM.