To us True Christians the Word of God is infallible.
To others like the Catholics they see their teachings of the Catholic Church as infallible.
Its by faith we believe the Bible is the very Word of God. But proving this to others who are blinded by Satan is another subject.
Wow, this was an interesting answer and made me think of how even more cunning and dastardly the devil is. Here we sit, many people still questioning the infallibility, even the authority, of God's Word, at least His Written Word, and it's the same trick foisted upon mankind since the beginning.....casting doubt upon God's Word, : Yea, hath God Really said...?
And yet, the devil knows full well the infallibleness and authority of God's Word!
The demons believe and tremble, and they know what's coming yet are still defiant.
If only we, and more of us, would believe and tremble with delight. Believe more deeply and with more joy in who Jesus is and what He's done for us.
Why is my heart often so hard or indifferent?
As far as proving God's Word? One poster said it can't be done. Perhaps from person to person, maybe, but God proved it to me, there's no doubt in my mind the Bible is God's Word, and I'm guessing many here believe the same.
How to prove it to others? Each person is different. Some have a ready heart...good soil...some not so much. Faith comes by hearing the Word of God, so you first have to have a person that actually believes there IS a God.
Then have them read or hear the beginning of John, or even 3:16-17. God's Word does not go out and return void, but accomplishes what it will by His grace, so pray that the person receives it and believes unto salvation.
One plants, another waters, but God gives the increase, and He will increase the faith to know His Word is the infallible truth. The book is true and infallible because the author is true and infallible. He doesn't have to prove Himself, but He does, and that's amazing grace. He's a good Father and a wonderful Savior!