I would not necessarily call this particular example "heretical," but it has caused millions of people throughout the years, including our very own day and age, to believe in something that is totally untrue, and that is never going to happen.
Jhn 14:2
In my Father's house are many
mansions: if
it were not
so, I would have told you. I go to prepare a place for you.
"Mansions" is a terrible translation. The Greek word simply means "room," "dwelling," or "abode," and this is how most other Bible versions properly translate it. In fact, this Greek word only appears twice in the underlying text of the New Testament, and the other time is in this same chapter of John where it is properly translated as "abode" in the KJV.
Jhn 14:23
Jesus answered and said unto him, If a man love me, he will keep my words: and my Father will love him, and we will come unto him, and make our
abode with him.
Nowhere does the Bible teach that Jesus is building "mansions" for believers in heaven, which is what people have ridiculously turned "my Father's house" into due to this terrible translation. Everywhere in scripture, including in this same gospel of John, the "Father's house" is a temple in Jerusalem.
Jhn 2:13
And the Jews' passover was at hand, and Jesus went up to
Jerusalem,
Jhn 2:14
And found in
the temple those that sold oxen and sheep and doves, and the changers of money sitting:
Jhn 2:15
And when he had made a scourge of small cords, he drove them all out of
the temple, and the sheep, and the oxen; and poured out the changers' money, and overthrew the tables;
Jhn 2:16
And said unto them that sold doves, Take these things hence; make not
my Father's house an house of merchandise.
Jhn 2:17
And his disciples remembered that it was written, The zeal of
thine house hath eaten me up.
In John chapter 14, Jesus told the tiny and specific group of disciples who he was actually talking to that when he returns there will be rooms for them in his Father's house or in the temple in Jerusalem in which he will be reigning at that time. Now, due to a terrible translation, people are believing in something totally different which is never going to occur. Not only this, but they are singing about it in many churches while reciting the partly fictitious words of "Victory in Jesus." Do you believe that God inspired this nonsense? I do not because God is neither a liar nor the author of confusion.
You are erroneous in this belief because my own in-depth research covered about 20 years of my life.
Why would I be bent on wanting to see errors in the KJV when I have been reading it for more than 30 years? In reality, it is KJV Onlyists who have repeatedly shown a stubborn unwillingness to admit that the KJV is translated very poorly in certain instances.