Prophecy is Testimony to God's actions...
...provided it has a good chronological backbone to it.
Biblical Chronology shows today that God exists, that He has been at work in the affairs of mankind especially in relationship to governments and His people Israel. Athiests will commonly challenge Theists to produce "a reason" to believe that God exists, and I believe I can provide this "reason." The only thing left is for athiests to leave open the possibility that there exists a reason that would convince them.
Anyway, prophecy, which is God telling us things before they happen is a reason to believe that God is outside of time ordering the events of mankind. The Jews have provided us with ancient texts that make outstanding claims of the future, and of God. Let us examine them with candid minds.
Daniel 8 is my first example. (Please read all of Daniel 8 now; otherwise you will be lost.) Daniel sees two empires at war with each other, beginning at a river. The second empire beats the first and sweeps over the land. This begins a time period that lasts for "2300 evenings and mornings." This time period ends when "the sanctuary" is cleansed.
Alexander the Great is understood to be the first Greek king. He defeats Darius at the Hellespont River in 334 BCE, and then takes over the empire. Big deal. That's history after the fact, right? Except that Jerusalem would be under Gentile rule for 2300 "days" until Israel is taken back.
A day equals a year often in prophecy. Moses does this: 40 days for 40 years of wandering, referring to the reconniter of the land of Canaan. Ezekiel does this too: chapter 4,
From 334 BCE to 1967 is 2300 years, because there is no year zero. 1967 is the year that Jerusalem was taken back by the Jews and thus ending the prophecy. This cannot be written after the fact.
The God of the Jews is controlling His Story. And that includes Athiests!
All of Daniel is precise like this. All it takes is an open mind. However, I suspect that anything proposed to be a "reason" will be rejected from the outset, thus setting up eternal security for any rational responder. They can never be wrong!