Easy. Because of the books of the prophets in the Old Testament. All the past prophecies have come to pass. Prophecies about nations, wars, captivity, kings, the coming messiah, the messiah’s life, the messiah’s sacrifice, etc.
There are indeed future prophecies that will come to pass soon. Prophecies like the rapture, the Tribulation, the second coming, the millennial kingdom, the great white throne judgement and the new heaven and new earth.
No other religion has prophets. Not Islam. Not Buddhism. Not Hinduism. Not nothin.
John 14:29 — The Lord says, “And now I have told you before it comes, that when it does come to pass, you may believe.
Also, the Bible was written by 40 different authors over 1,400 years – and it all lines up. Can you imagine trying to orchestrate a story like that with 40 different people over 1,400 years – especially with the lack of technology they had over 3,500 years ago?
Starting in the very first book of the Old Testament Bible:
Genesis 1:1-2 — In the beginning God [The Lord] created the heavens and the earth. The earth was without form, and void; and darkness was on the face of the deep. And the Spirit of God [The Holy Spirit] was hovering over the face of the waters.
Genesis 3:14 (the salvation event to come) — So the Lord God said to the serpent [Satan]:
“Because you have done this [got Adam to sin],
You are cursed more than all cattle,
And more than every beast of the field;
On your belly you shall go,
And you shall eat dust
All the days of your life.
And I will put enmity
Between you and the woman,
And between your seed and her Seed [Christ];
He [Jesus] shall bruise your head [defeat you at the cross],
And you shall bruise His heel [at the cross].”
Genesis 22:18 — In your [Abraham] seed [Christ] all the nations of the earth [Jews and gentiles] shall be blessed [with the hope of salvation through faith in Christ alone], because you have obeyed My voice [believed in Christ].”
Genesis 4:1-5 — Now Adam knew [slept with] Eve his wife, and she conceived and bore Cain, and said, “I have acquired a man from the Lord.” Then she bore again, this time his brother Abel. Now Abel was a keeper of sheep [think…the lamb of God – Christ], but Cain was a tiller of the ground [fruit]. And in the process of time it came to pass that Cain brought an offering of the fruit of the ground [the fruit of his own “works”] to the Lord [as an offering]. Abel also brought of the firstborn of his flock and of their fat [he brought a sacrifice of a lamb. Think – the lamb of God – Christ – sacrificed on the cross for the sins of the whole world…a foreshadow of what was to come]. And the Lord respected Abel and his offering, but He did not respect Cain and his offering. And Cain was very angry, and his countenance fell.