To have Faith, is to have a personal relationship with God. The topic is very ample; we can talk from the historical point of view, but what is most relevant here, without subtracting importance to the past, is its meaning in all its dimension, which is and will always be, the vision of God, for us, as individuals, family and society. The topic on Faith must not be simplistic. If I believe that God exists, that is good, but if I don't do anything, then, is very bad.  Since knowing that Truth exists, is supposed to take me to search, know, interpret and learn about it, otherwise my knowledge would be too loose. I can pronounce and repeat the name of God, many times, but if I don't feel Him in my heart, then, I am not true but  I will be ignoring the principles of Faith, in a deliberate way .
Which means, not only to love and to believe in theory, but practicing, to accomplish the effective conversion of faith. How to have more faith? The person who has faith, appreciates,  respects, honors and manifests it; it is a gift, given by spiritual virtue and the one who has it, knows in a positive, absolute way, that God loves and knows him and that God is just and true. And with this knowledge, he treasures faith and practices in a very active way  - by thought and action-  the laws and commandments of God,  based on the purity of Love. The key to growth is found here. Since man can only grow, by making progress in his beliefs, because faith is the active Love of God, the presence of His Word and it is a daily inspiration. By acceptance and knowledge, faith will grow in the Love expressed with solidarity to the human family
as universal service.