A common presuppositionalist question that Sye Ten Bruggencate and his idiot followers like Eric Hovind ask is whether it is possible that you could be wrong about everything you know. This question seeks to undermine your entire basis of knowledge from that point onward and if you answer yes, then in the eyes of Bruggencate and his ilk, you will have forfeited your right to make any truth claim.
But is it possible that you could be wrong about everything you know? The answer to that is - no. It is impossible. Think about this. If it is even possible that I could be wrong about everything I know, then I would know that it is possible that I could be wrong about everything I know, in which case I would be right about knowing that I could be wrong about everything I know, and that would defeat the whole argument. Thus it is impossible to be completely wrong about everything we know and the whole thing is self-defeating.
We could also point to some logical truths that must be true by definition, like for example, 20 is larger than 10, or that all blue cars are blue, or that all bachelors are unmarried, or that you cannot roll a 6 sided die and get a number greater than 6 or less than 1. These are logical truths that are impossible to be false, and we can be certain of that. Anyone who claims otherwise has the burden of proof.
So remember this if you ever get asked, especially if it is in person, if you could be wrong about everything you know. It's circular and self-defeating, and a total waste of time.
Welcome to Atheism and the City. This blog is about exploring atheism through contemporary urban living. I live in New York City, the secular metropolis, and I have an avid interest in all things religion, science, philosophy, politics, and economics. I am an atheist, a humanist, a philosopher and a thinker, and the purpose of Atheism and the City is to write about my thoughts and experiences on the subjects and topics that I have a passion for. Feel free to respond to any post whether or not you agree.