Some Bible verses about having faith in God are: Galatians 3:22, Galatians 2:20, Mark 10:52, Matthew 17:20, Matthew 14:31. The Bible also defines faith in Hebrews 11:1, the verse says, "Now faith is the substance of things hoped for, the evidence of things not seen." This verse essentially means that faith is believing wholeheartedly without seeing with your physical eyes.
Galatians 3:22 talks about how faith in Jesus Christ's power can deliver you from earthly sins, and believing in God's power and strength can see you through trials and tribulations. The verse Galatians 2:20 says, "I have been crucified with Christ and I no longer live, but Christ lives in me. The life I live in the body, I live by faith in the Son of God, who loved me and gave himself for me." This verse talks about how Christ died for the salvation of mankind so that every human being can have access to him.
Mark 10:52 talks about how faith in the healing nature of Jesus Christ can heal you from sickness and infirmities. Matthew 17:20 discusses how faith in Jesus Christ gives you power to speak things into the air and watch them happen, while Matthew 14:31 talks about how lacking faith in God's power isn't very wise.