How to have faith?

Faith comes from believing in the words of God.
Faith does not come from believe in belief itself.

That if you confess with your mouth, "Jesus is Lord," and believe in your heart that God raised him from the dead, you will be saved. 10For it is with your heart that you believe and are justified, and it is with your mouth that you confess and are saved. 11As the Scripture says, "Anyone who trusts in him will never be put to shame." 12For there is no difference between Jew and Gentile—the same Lord is Lord of all and richly blesses all who call on him, 13for, "Everyone who calls on the name of the Lord will be saved."

14How, then, can they call on the one they have not believed in? And how can they believe in the one of whom they have not heard? And how can they hear without someone preaching to them? 15And how can they preach unless they are sent? As it is written, "How beautiful are the feet of those who bring good news!"

16But not all the Israelites accepted the good news. For Isaiah says, "Lord, who has believed our message?" 17Consequently, faith comes from hearing the message, and the message is heard through the word of Christ.

Romans 10