I don't care about someone's book outside the Bible. I care what God says.
Which "Bible" would that be? EO, RC, or one of the other "Canons"? Or the KJ Only inspired, inerrant, & infallible cult?
Would that Bible be an English language -opinion - (e.g. KJV) of what the Hebrew & Greek say, that you are relying on? IOW man's - opinion - you are relying on. Or do you read the Hebrew & Greek at a scholarly level?
How do you know what God says? Does He speak to you personally in visions, dreams, revelations? Were you not listening to God for decades while you were a believer in libertarian free will before you became a Calvinist? Who were you, then, listening to for all those decades? Satan? Were you deceived by demons? How do you know you are not still wrong & deceived about many things?
Which of the hundreds of churches calling themselves "Christian" do you belong to? How do you know yours is right and all the others are wrong?