People whose lives revolve around issues way beyond survival are the ones who often need justifications which undeniably rely on the faith in survival. That's probably one of the reasons life is valued much more (in terms of investing money for a system) in US compared to other poorer countries.
An instance as simple as deciding to board a roller-coaster at Six-flags can highlight the importance of faith: Do we check for each nut and bolt of the machine we are boarding? Do we know for sure if everything is safe? It's just the faith in the system that if something goes wrong things will be "justified" appropriately by the system. Since human made systems cannot be perfect we ultimately tend to show faith in karmic system.
Have faith, fun and a happy Valentine's day whether you have a Valentine or don't.