Teaching love and obedience to God is as much an agenda as anything else. It’s more acceptable, but it still has a goal. Simply reading the Bible won’t prove it’s authenticity; it is not a formal book in any modern sense. It was a collection by the Hebrew hierarchy, and later the Christian hierarchies, of what seemed a best expression of Israel’s and Judah’s development as nations under God. Many books were considered scripture, but in the end they worked the collection down to a number and a form that best reflected both Judah and Christianity. They are not books of sweetness and light; many are gory, horrible things to read, especially stories of Joshua, Judges, many others. But they don’t stint on facing the bad with the blessed. It must be so, in order to highlight all that is necessary for God to make himself known.
The Jews don’t see prophecies of Jesus fulfilled, they see a still future messianic hope; and they have no use for the New Testament. Christians see the fulfilment of prophecy because they need or want to, or that they’ve been taught to. Reading the scriptures without placing restrictions or expectations on it, one would not see Jesus in the Suffering Servant of Isaiah; they would, looking at the history of Judah, find Zerubbabel, the leader and prince of the people taken to Babylon between 600BCE and 586BCE, and that is who Isa. 40 - 53 was originally reflecting when it was composed at that time.
But that doesn’t mean we can’t look at scripture for analogy and synonym. Poetic license is taken regularly in scripture, and that makes agendas. The authors of the New Testament looked at the Old and found what they needed, and perhaps what God wanted to make them see. Jesus is one interpretation; it is the interpretation accepted and taught by the Church. And while I explain the differences and the possibilities in scripture, since not everyone is Catholic, or finds Catholic analogy apropos to their own purposes and agendas, I still chose to believe, in faith, what seems almost–note: I say almost–contradictory and baffling. We are human, and humans must find connections between the physical and spiritual, but we also want to be rational, to take why we believe and subject it to tests, which is a good thing, if not always done practically and correctly. But not all things evident can or should be tested, they just ARE, and faith makes sense rationally then.
What it comes down to is the possibility of living as rational men and women while at the same time bowing at the altar in hope of what we know must be redemption. Redemption from sin? Possibly, we have done many horrible things as creatures, redemption from destruction, certainly; we have only a thin veil of morality between us and total chaos.