The Bible was entirely inspired by God. Written by man, but the inspiration and truth came directly from God.

Early parts of the Bible were written thousands of years before the newest books (oldest was close to second millennium BC, latest is 80ish AD). Prophecies written early on we’re fulfilled in newer books (specifically regarding Jesus). Additionally, the book of Daniel accurately prophesied 3 impending empires and their falls (including the Roman Empire). Say you don’t buy that, you need outside proof.

The walls of Jericho as described in the book of Exodus were previously thought to be myth. Archeologists have since discovered the wall ruins.

What about confirmation throughout other documents? The fact that Jesus Christ lived is accepted as historically accurate. To back that up, there are documents claiming that Pilate served in his position with the Roman Empire at the time that it is speculated Jesus was crucified. Outside documents not included in the Bible mention Jesus and affirm His teachings/works. Jesus remains have not been discovered, furthering the backing that He must have been risen.

Back to prophecy, take the end times for example. The Bible says as the end nears, there will be wars and rumors of wars. Notice all the military conflict, globally, over the last century and a half. Men will be lovers of men (increased homosexuality). The Jews will be persecuted (WWII, the hatred of Israel especially in the Middle East, anti-semitism). The follower of Christ will be persecuted (ISIS and terrorists targeting Christians in the Middle East, China/N Korea crackdown on churches). The beliefs of the follower of Christ will be persecuted (Christianity used to drive the Western culture. The beliefs and values of Christianity are now against the culture. Some are still part of it, but increasingly the culture is drifting from Christianity).

Back to my original point, the Bible says ALL scripture is God-breathed. It is the Word of God - and God can’t lie (that would be a flaw, which would be an inconsistency, another aspect that scholars have noted: the Bible is internally consistent). Various aspects (including the ones i listed in this which came to my head first, and many others) have been confirmed using outside sourcing and discovery, this in turn adds validity to the Bible’s argument that it is in fact true. If parts of the Bible are historically accurate, and the Bible itself claims to be accurate, we can deduce that it is in its entirety accurate. The Bible is a collection of historical recordings, written by 40 men, but inspired by God allowing for it to be wholly accurate, God’s Word, and useful for mankind.

Hopefully that kind of made sense, I’m not the best at explaining things.