Yes, the authors were ordinary human beings. And what they wrote reflected their own backgrounds, experiences, and particular ways of speaking. But, no, their process of writing the Bible was anything but ordinary. Here’s how Peter – the disciple – turned apostle of Jesus described this remarkable process in 2 Peter 1:20-21:
Above all, you must understand that no prophecy of Scripture came about by the prophet’s own interpretation of things. For prophecy never had it’s origin in the human will, but prophets, though human, spoke from God as they were carried along by the Holy Spirit.
What Peter describes is a divine-human partnership in which God initiates and guides the process of communicating the exact message he wants to reveal. He does this through chosen prophets and apostles who accurately record that message, but in ways that reflect their own unique personalities. Also, God superintends this process so as to prevent the introduction of errors into their writings.
So in the end you’re reading, for example, a psalm of David, the gospel of Luke, or a letter from Paul, but each of these can also be described as Scripture and the Word of God. (2 Peter 3:16). It is truth revealed by God, and confirmed thru other means, such as history and archeology, as we’ll see in other answers.