How do we know this is really God's Word? What do we mean when we say it is "inspired?" How did we end up with the books we have in it? Why these sixty-six books? Why not others, like the gospel of Thomas, or other apocryphal books? And how do we know the Bible is now a "closed" book with no additional written revelations to be added? What about other claims to divine authority? And why not include the teaching texts of other religions?
All of those are good questions that Christians need to be able to answer. I hope you will be able to deal with those issues clearly when people probe and ask. But there's one question that comes first. It stands out far above all the others. It has to do with the issue of absolute truth. And I mean any statements of truth, not just Biblical ones. Is there objective truth to be known, and can it be known for certain?
Our world is happy with people searching for truth. It is suspicious with people who say they have found the truth. That is considered arrogant.