I'm not a believer, but I'll answer your questions, since barely anyone here is a serious believer, other than the Moderator.
I have heard that there is a huge wall of ice of some sort around the edges...what brings you to believe this and why have we not discovered this?
They believe that Antarctica, or at least where Antarctica should be, is the huge wall of ice. I'm sure that no believer has ever been to Antarctica, because all sane people know that there is no 150ft wall of ice surrounding the Earth there, and that you can travel across one side of Antarctica to the other.
And finally...you've seen the space ships launch into space. If the earth was flat, wouldnt astronauts (However you spell it.) notice that the earth had an edge and said anything about it?
They believe that the various governments of the world are keeping a conspiracy, and that photos of the Earth looking round are fakes. An even more insane idea among some is that there is some natural phenomena that makes the Earth look round from space.
And if you were to sail across the ocean and go to the other side of this "flat earth" you speak of...wouldn't gravity completely change? I'd like to see where you all believe earth has this edge.
This can be simply explained by the fact that since no-one has gone there and come back alive, it's one of the great mysteries of the universe.
Hope I helped...