If God knows something is going to happen, what are the odds that it will not happen?
Ah, now you question God's motives. Why does God not prevent any and all calamities?
Who is to say he doesn't cause them? I suspect that the calamities that befall us are all a part of God's eternal plan, don't you?
Why does God not ensure that every Christian lives a happy and joyous life and never doubts?
I don't believe that any Christian on earth gets to fall in that category. Why should all of them? Are you questioning God's motives?
I don't know -- do you?
The Bible says that Judas was chosen "that the prophecy might be fulfilled." I believe that. Do you?
Why did Jesus choose Peter or Andrew?
Certainly it wasn't because of anything they had done. It was simply part of his plan. Why did Jesus choose you?