First of all... ***SPOILER!*** If you haven't read the book and want to... don't read this.
How did you, as a non-believer, take the ending of "Contact"? At first, I was kind of annoyed. Knowing that Sagan was a non-theist, why would he include a proof of a god, or some kind of design, at the end of his story? Isn't the universe beautiful without it?! Does he want to believe?
As I thought about it more, I became much less annoyed! After all, a good skeptic will keep his or her mind open to possibilities that can be proven or disproven. What I think Sagan was trying to say was that, look, you'd need some darn good evidence, such as a pattern in pi, to even begin to prove some kind of design in the universe. So if anything, it's a good counter argument to the claim "you atheists are just as dogmatic!" Show us the evidence, please, we'd be happy to consider it.