This is just wrong... I don't need to disprove something that has yet to be proven. If it has no evidence than I need no evidence to refute it.
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There's a difference between refuting a claim and making the opposite claim though. 'I do not believe God exists' =\= 'God doesn't exist' If you make a claim you need to be able to back it up. If you can't back up a claim with evidence then in a debate scenario you should not expect to convince anybody.