The Holy Bible IS The Infallible, Inerrant, Word of God to us humans. God the Holy Spirit "dictated" the very Words that the Writers of the 66 Books were to use. However, the "way" that each Writer wrote, the Holy Spirit allowed. Hence, Luke being a foremost Historian, says in Chapter 1 of his Gospel,
"Many people have set out to write accounts about the events that have been fulfilled among us. They used the eyewitness reports circulating among us from the early disciples. Having carefully investigated everything from the beginning, I also have decided to write an accurate account for you, most honorable Theophilus, so you can be certain of the truth of everything you were taught" (verses 1-4)
Here we are told that Luke "carefully investigated everything from the beginning", in his own "way", to ensure that what he recorded in his Gospel, is completely factual, and trustworthy. The Holy Spirit would have "directed" Luke to what exactly he needed to "investigate", and then given Luke the exact Words to write. Matthew Mark and John probably did not use this "style" in their Writing of their Gospel.
In 1 Corinthians 7:12, for example, where Paul is giving advice on relationships, he says, "And to the rest I speak—not the Lord". In verse 10 he said, "and to the married I announce—not I, but the Lord". In verse 40 Paul tells us, "according to my judgment; and I think I also have the Spirit of God".
"mechanical dictation", removes any "human element" from the "way" the Books were written.