the burden of proof lies with the believer. if you believe strongly in something, you should be able to prove it. or be willing to accept the fact that others may not believe in what you can't prove, without feeling offended or challenged.
Actually I disagree with the first part.
The believer has faith and doesn't need proof. The atheist on the other hand needs the proof. These proofs or non-proofs are not however seen with the scientific methods. These are matters of the heart and a higher understanding.
These second part is true. If a non-believer doesn't see things the way you do...then so be it. After all not all will ever agree on everything in this world..no matter how clear or how vague something it.