Do you understand the basic fallacy of your examples?
Cain, Abel, Noah, Enoch, these people could not have found faith from the Bible, due to the Bible not existing during that time. It is true that they find faith from the Word of God, but that faith is not from the Bible.
Likwise, when I read of preachers in China risking death to teach about Jesus, I have to question whether or not the Bible is our only source of examples of faith.
In fact, all of your examples talk of some faith greater than the Bible. It is not FROM the Bible that this faith comes, but that the Bible has come from this faith.
Likewise, I think the tree growing on the street corner provides greater faith for me than the words of the Bible. Anyone can write a book, not anyone can make a tree.