No doubt that in situations where there is no Scripture available, God does work differently.
But that is not our situation here. Here was have Scripture readily available.
After Pentecost, the bible was not needed to the Christians. Period.
Wrong.
Matthew 22:29 But Jesus answered them, You are wrong, because you know neither the Scriptures nor the power of God.
Acts 17:11 Now these Jews were more noble than those in Thessalonica; they received the word with all eagerness, examining the Scriptures daily to see if these things were so.
you just cannot see the point..and continue to use Scriptures to try and justify your lack of faith.