Sye Ten Bruggencate's presuppositionalist argument for the existence of God

Sye Ten Bruggencate, a Christian apologist, recently debated Matt Dillahunty of The Atheist Experience.

Bruggencate is a presuppositionalist, and offered the following syllogism to prove that it's reasonable to believe in the existence of God:
  • It is reasonable to believe that which is true
  • It is true that God exists
  • Therefore, it is reasonable to believe that God exists
Well golly, I'm convinced!

An astute observer may notice that this deductive argument is, in fact, logically valid – the conclusion necessarily follows from the premises. But it's a great example of an argument that can be valid but unsound, because at least one of the premises is false. 

Obviously we can have all kinds of fun with valid-but-unsound arguments:
  • It is reasonable to believe that which is true
  • It is true that interdimensional space monkeys exist
  • Therefore, it is reasonable to believe that interdimensional space monkeys exist
Or,
  • It is reasonable to believe that which is true
  • It is true that God does not exist
  • Therefore, it is reasonable to believe that God does not exist
And my personal favorite,
  • It is reasonable to believe that which is true
  • It is true that Mike D is the sexiest man alive
  • Therefore, it is reasonable to believe that Mike D is the sexiest man alive

Here's the argument in action:

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