Mostly people are [at least effectively] zombies [one definition = a person or reanimated corpse that has been turned into a creature capable of movement but not of rational thought, which feeds on human flesh]
"The fool foldeth his hands together, and eateth his own flesh." Ecc 4:5
"Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you." John 6:53
Are not then many people really zombies walking in delusion believing they are alive when they are dead?
@APAK The OP question is do we know the difference between truth and fiction? Unbelievers [Who are these?] do not, and probably many who are designated as believers [Christians] do not. So anyone who does not know who or what Truth is must have things mixed up [confused: "...God is not the author of confusion..." I Cor 14:33], the difference between truth and fiction that is. Is not fiction that which is not Truth?
Fiction: 1) invention or fabrication as opposed to fact.
As in, "He dismissed the allegation as absolute fiction."
2) A belief or statement that is false, but that is often held to be true because it is expedient to do so.
As in, "The notion of this country being a democracy is a polite fiction."
Truth:
"Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me." John 14:6
So who recognizes truth? Does what one would call firm knowledge about moon walking provide a useful or edifying answer?
"How is it then, brethren? when ye come together,... Let all things be done unto edifying." I Cor 14:26
Amadeus: I just do not understand the gist of your post to me. This OP is not specifically focused on being a believer or not. It does however focus on who is IMO is providing fiction for truth. All people should know the truth about men, the world and even the spiritual truth of God. It then suggests, at least implicitly, that evil men, not usually believers, can sway any man, whether they be a believer or not.
It is an open ended type OP. It can give warning to those that think they are believers, to re-examine and check their spirituality and their standing with their Creator, as they live in this world. They need to re-examine their truth in all things, whilst living in this world. It may be fiction and deceit and they are being fooled, deliberately.
And the truth for this OP, is not necessarily just the truth from scripture. The world can blind any man/woman into thinking their truth they hold is really fiction. It is also can be a warning to those that are not believers to examine where their sources of information for the truth is derived. Of course we as believers pray for wisdom and truth. The unbeliever has not this vehicle at their disposal for the discernment of truth versus fiction (lies).
I hope this clears things up a bit...Let me know
APAK