My bigger problem with that scripture is what happened a few verses before where Jesus thought a demon was causing a boy's epilepsy!
The idea that having faith in something and using it as a motivator is nothing to scoff at, though. Having faith in the right thing, and directing your time and energy appropriately can figuratively move mountains.
The problem with this scripture is that it purports that if you have enough faith in God, you can cast a demon out of a little boy and cure his epilepsy. There is so much wrong with that, I don't where to begin. Having faith in something that doesn't exist (God) will accomplish nothing for you. Believing that demons exist and they cause illnesses and medical defects is another story!
I'm going to stick to putting faith in myself and those around me that deserve my devotion.