If we reject faith, we are no longer children of God, and we are condemned to wander through our life on our own. The second primary commandment is that we love our neighbor, that is, that we extend ourselves to want and to do good to all those who are God's children and so our brothers and sisters. Just as God looks after the world and the human beings He has created, so must we do also because we share God's life. Loving runs in the family. One might say it's God's family business.
Christian life can get tense and complicated.
Often it seems that the Church demands so much of us, that the moral code we are called to observe gets so complicated. We never seem able to grasp fully what Jesus teaches us. There are always further implications of His life and preaching to learn and assimilate. Our relationship with an increasingly complex world around us seems itself to grow ever more complex. Identity questions can get very painful.