The ultimate question !

[Edwardo Piet]

What does it imply then? As far as I can see if someone is saying something will happen then they know it's going to happen.

What is your alternative explanation?

Sometimes it means that they will make sure it happens. Tecnically a prophecy is an inspired message; a revelation of divine will and purpose or proclamation thereof. It could be a moral teaching, or a divine command or judgement, or a declaration of something to come. The Hebrew nava and Greek propheteuo doesn't convey prediction or foretelling in the basic sense.

For example, when Ezekiel was told to prophecy to the wind this resulted in the raising of the bones to life. (Ezekiel 37:9 - 10) At Jesus trial those who slapped him asked: "Prophesy to us, you Christ. Who is it that struck you?" (Matthew 26:67 - 68 / Luke 22:63 - 64) meaning they asked for divine revelation rather than prophecy.

So you don't believe that God is omniscient and omnipotent then? Which after all is a contradiction anyway.

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I'm not sure that you can walk outside tonight and look into the midnight sky and say, "There is no God out there."

Well you can. And I can. I just wouldn't need to. There's no point. I can say that "there is no God" or I "Don't believe in God" but I wouldn't say "I KNOW there is No God" Or "I am CERTAIN there is no God". Unless I was half-joking. I CAN however, say that there is no God if I'm speaking de-facto scientifically. Its just annoying to repeatedly say that I believe that "there almost certainly is no God" but thats what I think really. When I say "There is no God" it would just be a shortening of that.
I would never say "I KNOW" or "I am CERTAIN" unless I wasn't speaking entirely literally and/or I was half-joking.

Until the day humankind recovers ancient text that reveal an invisible pink unicorn created the universe, and formed mankind from the dust of the earth.. then we can further discuss that topic. I think for now that arguement is flawed to the core, as I just explained.

But that's bullshit because no ancient text has revealed anything supernatural. The Bible hasn't revealed "God".
That's the whole point. Holy scripture is a load of bullshit so you might as well believe in the IPU or the FSM. The burden of proof is on the believer. And there is no proof of the existence or "truth" of God.
No ancient text has ever "revealed" that anything supernaural EVER 'created the universe, and formed mankind from the dust of earth', or formed man in any other way. There is no evidence of God's existence. Religion is bullshit. The bible is bullshit. But most of all God and faith is bullshit. And Dogmatic faith in God is beyond bullshit. Of course dogma itself is bullshit too.