ROMANS 10:17

Faith in God and His Word operates on the same principles faith in anything else. Faith comes from the information you receive. Information can come to you through any of your five senses, or from your spirit.  When you decide to accept any information as worthy of being acted upon, it becomes part of your belief system. That is how you get faith. Please remember faith is a noun form and believe is the verb form of the same word. Each one of us chooses whether we will believe something, based on our evaluation of the evidence presented to us. No one was born with beliefs. Every belief you now have was acquired as a decision you made at some point in your life. You decided to believe what you now believe. Since every belief you have came as a result of a decision you made, every belief can also be changed by another decision. But because faith is always based on some evidence, we must have evidence that convinces us before we can change any belief. Life constantly presents us with evidence which forces us to make decisions, based on this question, "Is this evidence sufficient to accept as truth?" The primary evidence God has given us so we may have faith in Him is His Word. God is not a liar; He can be trusted. Whatever
God says, always comes to pass for he tells us that His word will not return to him void, It will do exactly what He said it would.  A literal translation of Romans 10:17 tells us that faith results from accepting the God message. How does someone get faith in God? By being presented with truth about God, and accepting it as the truth. Faith in God comes by choosing to accept the message of God. We must not restrict our understanding of how faith comes to our physical sense of hearing. Every way we can receive information about God is an avenue that can bring us faith. Bible faith can result from what is seen according to John 20:8
and 20:29. Faith in God can also come through the sense of touch. Otherwise no deaf and blind person could ever be saved, for they receive the message of God through reading braille with their fingers.
You can read your Bible and decide to believe it. Then you will have faith in God, for the Bible is God's written Word. We get faith in God by making a decision to accept God’s written Word, the Bible, as trust worthy of being acted upon.So if someone says they don't have much faith, the solution for them is to see the evidence from God's Word on that subject, then choose to accept what God says as truth.

17 So faith comes from what is heard, and what is heard comes through the message about Christ (Romans 10:17).