Let me put it this way: If Joe says: "there is a deity in the universe", and Jack says: "there is no deity in the universe", let me ask you, who has the heaviest burden of proof? Because in order to conclude beyond question that there is no deity in the universe, Jack must scan the entire universe to make good on his claim. As for Joe, if he finds a deity lurking on the nearest planet, his search for evidence is over. Therefore, the heaviest burden of proof falls on atheists, not on theists.
This is not to say that Theists are right and Atheists are wrong. This simply means that the Atheist demand for evidence from Theists is a fallacy because they make the same grandiose claims without providing any evidence to back it up. It's better to be a absentheist, by far.
Eden