The literal definition of the word.
metanoia: change of mind, repentance
Original Word: μετάνοια, ας, ἡ
Part of Speech: Noun, Feminine
Transliteration: metanoia
Phonetic Spelling: (met-an'-oy-ah)
Short Definition: repentance, a change of mind
Definition: repentance, a change of mind, change in the inner man.
http://biblehub.com/greek/3341.htm
Repentance needs a context. The context in scripture with regard to salvation is sin. I have made a case for that. At this point (no offense intended) you have not made a case only a claim. I am asking you to make a clear case for your position that the context of repentance is something other than sin with regard to salvation.