In genuine faith we hold our beliefs firmly, but lightly. We trust in God, not in our particular understanding of God. That is why people of deep faith are one at heart, even though their beliefs may differ widely. When beliefs become more important than faith, even small differences create insurmountable barriers. When we grow in gratefulness, we grow in faith.
Gratefulness implies trust in the giver.
Faith is the courage to respond gratefully to every given situation, out of trust in the Giver.