So this is what we have to do. We have to approach our Christian life as a kind of a battle where we must prevail over the enemies, cross over the roadblocks and the stumbling blocks and the pitfalls. All those things are adverse circumstances and temptations and sins that we have to overcome and grow and come to perfection.
And so God is telling us in the conquest narrative that we have to face something very similar in order to inherit the Kingdom of God. He has given us as a guarantee some of the Holy Spirit to help us along the way. And He has given us a promise of eternal life but it is really not fully achieved until the resurrection. So that time in between, what we call the time of sanctification, is when we face all these battles and must overcome and grow.