How does a person acquire faith? Is it by reading the bible? In Romans 10:14-17 this is written, “How then are they to call upon him whom they have not believed? But how are they to believe him whom they have not heard? And how are they to hear, if no one preaches? And how are men to preach unless they be sent? As it is written, How beautiful are the feet of those who preach the gospel of peace; of those who bring glad tidings of good things! For Isaias says, Lord, who has believed our report? Faith then depends on hearing, and hearing on the word of Christ.”
It would be good to ask sola scriptura the question, “From whom did he hear his faith?” If he has not heard it from another, meaning he acquired it only through personal readings, then by the above passage, his faith would not stand.