I define faith as believing in something that is obviously false. Belief in something that is clearly impossible, untrue, a lie.
"In spite of the fact that George drank every day for 17 years, Jan had faith that he would stop today."
"faith of a mustard seed you can command a mountain to move"
Faith is belief in the ridiculous, the stupid, the invisible, the unproven, the impossible. Faith is identical to delusion.
It does not take faith to belief in things like scientific theories, because they are obviously true. They come with evidence. Faith is belief that the world is 6000 years old in spite of overwhelming physical, falsifiable evidence to the contrary.
How do you define faith?