First let's understand what faith is. Faith is actions coupled with belief in something which is true. Here is a scriptural example of faith,
"By faith Noah, being warned of God of things not seen as yet... prepared an ark to the saving of his house..." (Hebrews 11:7)
So not only is there obvious belief, but also an action to go with the belief. I will list a few ways you can increase your belief in Jesus Christ that will help you endure lifes challenges.
1.) Prayer. If you aren't saying your prayer's and trying to draw closer to God it would be like trying to come to shore with your anchor still out. The scriptures teach that you should ALWAYS have a prayer in your heart. I think of it the same as I would with the relationship with someone you love. If I never communicated with my parents how could I form any relationship with them? I couldn't. The same principle applies with God.
2.) Studing the scriptures. You cannot find comfort and an increase in belief if you aren't learning more about what you are believing in. Just as Jesus said, "Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me." (John 5:39) We have been counselled by the Saviour to always be learning more about Him. The more learn about Him the more we can come to love and appreciate Him.
3.) Live it. Regardless of your religion if you live the principles and commandments you have received you will draw closer to God than if you were to disregard them. Living your religion says more to God than speaking it does. God is pleased with those who will show their love for Him by obedience.