The trouble is, a Christian has extra factors to cope with and these can very easily increase the fear level. There are the hard words of Jesus, ideals that we daily fall short of. Then there is the limited tangibility of our faith. It often seems a mystery beyond our grasp. We know how to live for our Lord, but so often we do nothing and watch lost opportunities pass us by.
Confidence comes in the successful doing of things.
Once we have achieved an objective, successfully negotiated a life situation, made the grade, it is then that our self confidence grows and fear subsides. I have to say my own son taught me this lesson. He was affected by claustrophobia, as I am. Life's circumstances would press in on us and we would feel the need to escape. My mother to this day will not get into a lift, and there is no way I am getting into an aeroplane with a 7 ft. ceiling.