The one who is standing away is apostate (literally "to stand off," from apo- "away from" + stenai "to stand"). Ironically, proponents of untruth may call truth-seekers as apostates, thus making the term meaningless.
For example, Paul, the greatest of all apostles, taught untruth (stood away from truth) [see his main teaching in Romans 5:12-21] even though he had known the following truths:
1) All humans did not become sinners through one man (Genesis 5:24; Job 1:8; Psalm 18:23; Ezekiel 14:14 and compare Habakkuk 2:4), hence there was no need for anyone to pay ransom.
2) In the Old Testament, the Messiah refers to a “prince of peace” who literally rules from Jerusalem, not merely anointed to the office to do the work in some distant future and get killed before that future occurs. (Isaiah 9:6-7)
3) If ransom teaching was the main theme, Jesus would have used all his skills to explain it. In contrast, he believed he would never be killed (Mathew 21:33-39) which means Mathew 20:28 is obviously a later adoption which Luke deleted from his work (Luke 22:25-27) after comparing with original manuscripts (Luke 1:3)
In spite of all these, Paul chose to teach untruth (apostasy). If Bible’s main teaching itself is apostasy, how can Bible-supporters’ calling us apostates have any meaning?