Speaking out publicly is not easy for most people. In fact, in surveys where people are asked to list their greatest fears, public speaking is consistently near the top of the list. It is not easy to speak of our faith. Some may even consider faith to be a private matter. A matter best kept to ourselves.
Christian faith is a confessional faith.
That is made very clear in the scriptures of the Old and New Testament. We are called to speak openly of our faith. Moses called on the people of Israel to tell the story of their journey through captivity and into freedom. That was a very important part of offering the first fruits of their harvest. Paul reminded the Romans that God's message is near them.