Hebrews 11:6 And without faith it is impossible to please Him, for he who comes to God must believe that He is and that He is a rewarder of those who seek Him.
Many times our Christian life is a mixture of faith and doubt. When people doubt God they feel ashamed and unworthy of God's love. So, they say they will try harder to have more faith. This is foolishness. You can not try harder to have more faith anymore than you can try harder to jump to the moon. As a matter of fact both efforts are foolish and exhausting and in the end disappointing. What can we do then. Don't try just trust. Do you believe when you get in your car each day it will start. Experience either tells you yes or no. It is the same way with God. As you spend time with God and experience His love and faithfulness your faith will grow. Spend time in His Word, in prayer, in worship and as you do you will find in every instance He will never fail you and that is how you will develop more faith. Not by trying but by trusting. I trust you will try this.