In a nutshell, the presuppositionalist would say that the greatest proof of the existence of God is the impossibility of the contrary.

edit: and yes, the anti-theist cannot properly recognize the evidence due to his presuppositions, but it's not enough to leave it there. Otherwise, the argument for both worldviews would be at a standstill. Rather, the best question to pose is which worldview can survive an internal critique?

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Vaughn Shideler
St. Andrew's Presbyterian Church
Toronto, ON, Canada