How can anyone believe in something
they have never heard?

That seems to be a pretty high bar of faith to overcome.

Or Refused to Hear?

Romans 10:14-16
14 But how can they call on Him they have not believed in? And how can they believe without hearing about Him? And how can they hear without a preacher? 15 And how can they preach unless they are sent? As it is written: How beautiful are the feet of those who announce the gospel of Good News! 16 But all did not obey the gospel. For Isaiah says, Lord, who has believed our message?