The desire to know creates a natural faith that can be further gifted by God with a supernatural faith. When You exclaimed, “...Oh you of little faith...” You probably meant, ‘you with little desire to seek to know.’ And when You said, “...your faith has saved you...” I think You meant ‘your desire to seek to know has saved you.’
Seeking the truth, seeking You, is seeking to know that which saves us. At the very least, such seeking shows that we want to believe. In order to believe one must start with wanting to believe. It seems to me that those who are of little faith are those who consider the effort of seeking too great. It is the effort put forth in seeking, persistently, by which faith saves us. That “faith can move mountains” is a metaphorical tribute to the effort put into seeking.
When You were confronted by individuals who wished to be cured of some malady, You were sought out by them. They came to You. In such instances You not only cured them but You said to them: “your faith has saved you.” It was their seeking You and coming to You that so moved You. It was this that indicated faith. Let us not also forget that You continuously invite us to come to You. We have but to make the effort and we grow in faith. Implicit in understanding that we are all in equal need of seeking and coming to You is the acceptance of, and the outreach toward, all others making the same journey.