As usually happens at times when I free my mind to the teachings of Chaos, Eris instructed me. Faith has come to be greatly misunderstood over the millennia, and it's about time that someone set the record straight.
Faith is an absolute, unreasoning belief in something.
My belief in the absolute truth of your Doktorin is one example, but, more interestingly, so is the belief in an omnipotent being. Such a being could do, literally, anything. Make a rock so big he couldn't lift it, and then go ahead and lift it and not lift it simultaneously. Now, no one could possibly believe that you could lift and not lift something at the same time, especially if it's so big that you can't lift it in the first place. That doesn't phase a Christian, though.