According to T.B. [an atheist]:
An atheist needs do no more. An atheist does not need to prove that God does not exist — the theist must demonstrate that God does exist.
To which Jonathan Sarfati replied:
T.B. seems to be using the tactic of throwing the burden of proof on those asserting an affirmative proposition, e.g. ‘God exists’ as opposed to the negative proposition ‘God does not exist.’ But then an example of self-refutation occurs: the proposition: ‘The burden of proof falls on the affirmative position’ is itself an affirmative proposition, so requires proof in itself!
But this commonly overlooked point aside, as shown by the Encyclopaedia Britannica, atheism is just as much an assertion as theism. Therefore the burden of proof falls equally, and a fairer debate question would be ‘Does God exist?’
Also, atheists assert many affirmative statements without proof, eg. that the universe is either eternal or came into existence uncaused, non-living matter evolved into living cells by pure undirected chemistry, complex specified information arose without intelligence, design features arose without a designer, moral sensibilities arose out of amoral matter.
Sarfati, J. (2007). Atheism is more rational? Creation Ministries International. Available http://creation.com/atheism-is-more-rational. Last accessed 13th Jun 2015.