How do we know the Bible isn’t missing books or that books that do not belong are in the Bible? How do we know the Bible is correct?

The history of what Christians call “The Bible” is quite open and recorded. If the question is about the process and compilation of what we use today as our “Holy Bible,” there are a variety of courses in Religion departments and at Theological schools that can answer most questions relating to canon and “time line.”
If the question is more a matter of faith in the message of the Bible, then the first course of action for answering the question is to read the material we have, (the Old and New Testaments), and learn as much about it as possible. Does the message satisfy? After knowing and understanding the whole picture of God’s revelation through this written word, are there parts “left out?” Can you point to flaws? Is your faith lessened or strengthened by the study you have made of Scripture?

Remember, too, that a LIVING God (see questions 1 and 2) is known through revelation, not deduction. For most Christians, the Bible, the words we can read and see, are pointers toward the Spirit of God that inspired them. One knows the Bible is correct by seeking the Author of everything.

“You will seek me and find me when you seek me
with all your heart. I will be found by you, declares
the Lord.” Jeremiah 29:13-14a

Suggested reading:

• Abraham Joshua Heschel (a Jewish philosopher): God in Search of Man