Fulfilled prophecy is evidence that the Bible is from God

"There is no evidence that 45:1 and 13:19-20 are both referencing the same event."The last verse of the previous chapter, 44:28, says, "The One saying of Cyrus, ‘He is my shepherd, And he will completely carry out all my will’; The One saying of Jerusalem, ‘She will be rebuilt,’ And of the temple, ‘Your foundation will be laid.’” Babylon conquered Jerusalem and it had the Jews in captivity. But after Cyrus conquered Babylon, the Jews were freed from their exile and, thus, Jerusalem could be rebuilt. So it's obvious chapter 45 is talking about Babylon."many people lived in there for hundreds of years after the empire fell" Isaiah 13:20 does not say Babylon would become inhabited as a direct result of Cyrus' conquest. But Cyrus' conquest did make the Babylonian Empire fall, as was predicted in verse 19, and once it became inhabited, it was never rebuilt and inhabited again as predicted in verse 20."there is no record of the celestial bodies going dark around 539 BC"Lack of evidence for part of the prophecy is not evidence of this part failing and, thus, does not nullify the parts of the prophecy that did fulfill. "this contradicts his claim that the subject matter of these sections is identical" The change of tone in chapter 40 is appropriate because the subject matter changed from pronouncements of international desolations to words of comfort for God's people. But, as I explained before, it's obvious 45:1 is talking about Babylon. The Christian Greek Scriptures credited both Isaiah 1-39 and Isaiah 40-66 to "Isaiah the Prophet". Jesus himself when he read from “the scroll of the prophet Isaiah” in Luke 4:17-19 he was reading from Isaiah 61:1, 2. Furthermore, the copyist of the Dead Sea Scroll of Isaiah began the 40th chapter on the last line of the column of chapter 39. This is evidence that he knew nothing of any supposed division in the book (Source: http://wol.jw.org...). "He and his men [...] went under the gates to infiltrate the city"Where exactly does your source say they went "under" the gates? The basin they dug was to divert the waters, they didn't get inside the city by digging a tunnel under the gates. "the second and third authors of Isaiah were deliberately extending the text of the first Isaiah"There is no evidence that the book of Isaiah had three authors. One author is perfectly capable of changing the tone of his book, and the evidences mentioned previously suggest only one author."Finally, my opponent says that Isaiah 13 claims that the Medes (not the Persians) would conquer Babylon"Isaiah 13:17, says the Medes would be part of this conquest, not that they would be the only ones to conquer Babylon, and this part of the prophecy did fulfill. Chapter 45 further adds that God would use Cyrus, the king of Persia, so we know the conquest wouldn't be by the Medes alone.Thus, this constitutes a fulfilled prophecyNow let's look at another prophecy.Prophecy: Daniel 8:3-8As I raised my eyes, look! there was a ram standing before the watercourse, and it had two horns. The two horns were tall, but one was higher than the other, and the higher one came up later.I saw the ram making thrusts to the west and to the north and to the south, and no wild beasts could stand before it, and there was no one who could provide rescue from its power. It did as it pleased and exalted itself. As I kept watching, look! there was a male goat coming from the west crossing the surface of the whole earth without touching the ground. And the goat had a conspicuous horn between its eyes. It was coming toward the ram with the two horns, which I had seen standing before the watercourse; it was running toward it in a powerful rage. I saw it closing in on the ram, and it was filled with bitterness toward it. It struck down the ram and broke its two horns, and the ram was powerless to stand up to it. It threw the ram to the ground and trampled it down, and there was no one to rescue it from its power.Then the male goat exalted itself exceedingly, but as soon as it became mighty, the great horn was broken; then four conspicuous horns came up instead of the one, toward the four winds of the heavens. The two-horned ram that you saw stands for the kings of Me'di·a and Persia.The hairy male goat stands for the king of Greece; and the great horn that was between its eyes stands for the first king.As for the horn that was broken, so that four stood up instead of it, there are four kingdoms from his nation that will stand up, but not with his power.Fulfillment: In 331 B.C.E Alexander the Great conquered the Medo-Persian Empire. He wanted to rebuild Babylon with greater splendor and make it the capital of Greece. Alexander died in 323 B.C.E before he could accomplish this. After his death four took his place as the Bible predicted: Lysimachus, Cassander, Ptolemy and Seleucus, Alexander's four generals. Evidence that this prophecy was written before the event is the testimony of the historian Josephus who said the prophecies of Daniel were shown to Alexander the Great when he entered Jerusalem in 332 B.C.E. Here is the quote from Josephus:“When the book of Daniel was shown to him, in which he had declared that one of the Greeks would destroy the empire of the Persians, he believed himself to be the one indicated.” (Source: Jewish Antiquities, XI, 337 [viii, 5]) Furthermore, history shows that Alexander bestowed great favors on the Jews, most likely because of what Daniel said about him in prophecy.