[Dismas]

The person making the claim has the burden of providing proof, but absence of evidence is not evidence of absence. The universe is practically infinite and our perceptions are limited, so we can't disprove the existence of a divine being (or unicorns for that matter). I've found that agnosticism is more scientific in its approach, simply because it doesn't claim any certainty. Science tends to only deal with things that are observable, whereas faith does not.