Hebrew 11:6
And without faith it is impossible to please God, because anyone who comes to him must believe that he exists and that he rewards those who earnestly seek him.
If you are wondering how to get more faith, I would say...
Romans 10:17
Consequently, faith comes from hearing the message, and the message is heard through the word about Christ.
So, If you are praying for rain, BRING YOUR RED UMBRELLA!