Just so we understand what we mean by 'faith', here's a nice little vid from NoelPlum99 with which I agree. For me, it illustrates the likelihood of faith in rational/empirical scenarios: the more evidence there is, the less likely it is that faith will be required to believe.
http://www.youtube.com/watch?v=z9T2Q0kNjnA
http://www.youtube.com/watch?v=z9T2Q0kNjnA
Sum ergo sum