Faith comes by HEARING. HEARING must be given.
In my personal belief.
I believe as the Gospel of Christ is being preached, as we hear it the Holy Spirit imparts the Faith. Because of that imparted Faith we have the ability to Believe.
But if there is no preaching and hearing of the Gospel of Christ, there is no imparting of Faith to believe.
So anyone who has ever been saved first Heard the Gospel of Christ. And this is why Paul makes it clear in a couple of places that Hearing produces Faith.
When preachers preach, if they do it properly, they do it under the influence and leading of the Spirit. So those words spoken have spiritual emphasis to them. And the way God created us, when our ears hear it, it's a doorway to the heart. Which the Spirit of God begins working on you. This ultimately leads to Faith and then belief in Jesus. It causes us to Repent and be filled with the Spirit of God.
But it all begins with people "must" be in the presence of the Gospel of Christ being preached so it can be heard.