When you say “defensible”, if you mean by that something that can be answered for, then all faith is to a degree defensible as faith is its own defence. If you mean empirically proveable, as in something I can test by experiment, then the case is not strong. You get all kinds of arguments about how could Moses have known this or that, but in the end it comes down to what Jesus said “My sheep hear My voice”.
God has made a world in which in some places you might see ten thousand penguins on a beach but the right mother hears the voice of its own chick and the chick recognises its own mother. When you have read the Bible and heard in it the voice of God to your heart, then this is a stronger case for inspiration than worrying about how to understand this verse if it seems to contradict that verse, etc etc. The way that God speaks to YOU in the prayerful reading of the Bible, this is God’s word to you. In order to get a balanced view it is a good idea to read the whole Bible, which creates a complete and internally congruous view of the development of the idea of salvation, from the law given to one nation, via prophets, judges, then kings, and the continual failure of people to keep a law that reflected the holiness of God, if only at times symbolically, through to an actual physical incursion of the Creator into His own creation, becoming one of us, and then sacrificing Himself to pay the ransome for our sins, enable an exit route from sin into atonement, resurrection and eternal life. This is the message that the Bible has and it is not the message of any other book other than books based on it.
If this be the meaning of life – and I find no better meaning anywhere on Earth in anything else, and all other explanations of what this life is for do not ring true to me – then the place this is revealed is in Scripture and I believe and defend that the Bible is therefore the inspired word of God, authorative, and containing sufficient for me to know so that I can believe the essentials needed to believe in order to find myself covered by the sacrifice made by Jesus Christ.