Your mission, should you choose to accept it, is to read the quote by Kim Riddlebarger in the Faithful Sampler in the left sidebar.
Then go to this post and read the last comment, which was made sometime last night.
Now, answer these three questions for me (you don't have to actually respond here unless you want to):
1. How many examples of an unstated presupposition do you see? (Hint: There's a BIG one in the first line of the second paragraph.)
2. Do you think any of what he said makes sense outside of his (and possibly your) presuppositions?
3. How could you restate this argument to make it coherent to someone who doesn't hold your presuppositions?