If you are committed to a spiritual path in your life, you are twice as likely to say you are "very happy," according to psychology research. Spirituality gives you a context for your life that is greater than your ego can see. The ego, which is basically your self-image, is based on an optical delusion of separation. Its outlook is: Everything Good's Outside. A strong spiritual faith helps you to connect to what is real, to what is here now and to what has already been given to you.
A daily spiritual practice that you enjoy doing will help to increase your happiness score. The essential aim of any spiritual practice—be it meditation, prayer, yoga, tai chi, etc.—is to help you remove the blocks to the awareness of the happiness that already exists in the center of you. Spirituality connects you to your "being" so you don't get lost in going, doing and having. It helps you to identify with the idea that the soul is joy, and to realize that you are what you seek.
Next: How do you view happiness?