You have to believe in God before you can say there are things that man was not meant to know. I don't think there's anything man wasn't meant to know. There are just some stupid things that people shouldn't do.
When I told the people of Northern Ireland that I was an atheist, a woman in the audience stood up and said, 'Yes, but is it the God of the Catholics or the God of the Protestants in whom you don't believe?