You: Tell me, why should I choose your faith and discard all others?

Aaron: Because my faith, faith in salvation through Jesus Christ, is the one true faith.

You: Can you demonstrate that?

Aaron: There is no way to show true faith, it is something one feels in the heart.

You: A great many people who have beliefs different than yours have faith that their beliefs are correct.

Aaron: They are wrong.

You: And only those who agree with you are right?

Aaron: Yes.

You: How do you know.

Aaron: That is my faith. God would not allow me to be deceived.

You: Essentially you are saying that you have faith that your faith is true.

Aaron: Are you are trying to get me to talk in a circle?

You: You're doing a fine job by yourself.