Faith How much Do I Need?

Never really thought before about my faith. It was just something that seemed to be there. No one ever really questioned my faith. Or asked me what the word faith meant to me. Until today during Bible study. Our faithful leaders in our study group always give us much to think about.
Like how much faith is enough? It's a good question. Mt 17:20 says if you have faith as small as a mustard seed, you can say to this mountain move,"Move from here to there and it will move. Nothing will be impossible for you." A mustard seed huh! Pretty small indeed. I know at times I lack the strenght or conviction To even tell myself to read my Bible. How could I have the conviction to tell others about my faith in someone I've never seen. I know him only through what I"ve read in this wonderful book the Bible. A story of how God loved us so much he sent his only son. Here to bear our sins, which he never committed. So we might have a life with him in glory. My small mind has a hard time grasping a love so infinite. That his son would give through his faith his life for me. When I knew him not. And there are times I act as though I still don't know him. Maybe I should rephrase that my actions. Certainly don't show I'm a child of the father. So my faith I must nuture through reading his word and praying for his help.