ok to be more precise faith (the religious one - and actually even not religious one) is not totally related to the fact that we believe in God ... it's a matter of confidenceyou believe that some things can really lead to something better (religiously as christian / Christ's doctrine about how to treat each other and ourselves) ... I don't really feel the need to go further than that ...
As for the reward I don't really care ... I am what I am, I have the feeling that I have and I'm not gonna be hypocrite about it (since I don't feel that I'm a monster, I feel ok with myself and think that God who knows me, know that I'm doing my best relatively to what I am and my spiritual state, even in not being perfect).
Anyway I'm not searching for perfection about myself I more looking for understanding ... you can yell on me /treat me like shit wathever like, if I understand your why everything will still be ok ... you can be nice to me but if I feel that you are hypocrite (well ... it's a standbye).