You are incorrect. The word used in Luke 1:28 is **kecharitomene **and is NOT found ANYWHERE else in the Bible. It is in fact the Perfect passive participle of the word charitoo.
God Bless
The two words are the same and have the same meaning in both contexts. The word in Luke (
kecharitomene) is a participle of the verb
charitoo (in Ephesians), a factitive verb from the root
charis which means favor or grace. If sinlessness is implied, it has to be derived from the context, and not from grammatical forms of the verb. You need to show how the specific grammatical principles apply in the context of Luke 1:28 and Eph. 1:6 to say that the two words have different meanings. The perfect in Luke simply means that Mary has received favor from God as a result, contextually, of being about to become the mother of our Lord.
(There is a really intensive interaction with this, by Robert Dean Luginbill, Ph.D. Department of Classical and Modern Languages University of Louisville Louisville, KY 40292, on this site:
http://ichthys.com/mail-Mary-full-of-grace.htm)
Robert Sungenis of Catholic Apologetics Int’l admits that, “although it [Luke 1:28] may imply Mary’s immaculate conception,
it does not explicitly teach it. The verse would not explicitly teach the doctrine unless it said: ‘
Hail to the one who has been immaculately conceived.’”
Dr. Sungenis further admits that, “even if we [Catholics] translated Luke 1:28 as “full of grace,” this does not necessarily mean that Mary was immaculately conceived. It only demonstrates that Mary was full of grace
at the time the angel spoke to her.”
He says that, “Extending Mary’s full state of grace back to Mary’s conception… is the prerogative of the Church in her dogmatic decrees [not the meaning in Luke 1:28], since there is no explicit verse of Scripture teaching Mary’s immaculate conception.”
What Dr. Sungenis is saying is that the use of the word
kecharitomene, does not mean Mary was full of grace all the way back to her conception – that she was sinless all her life. However, he says that Catholics can extend Mary’s being full of grace all the way back to that point because the meaning “allows” for such an extension.
The fact is, this belief of Mary’s immaculate conception/sinlessness did not come about from a reading of the Scriptures [not even Luke 1:28]. The doctrine was believed first and then a search of the Scriptures was made to justify the belief. Dr. Sungenis confirms this when he said that, “
if we were looking for a verse that was in keeping with the doctrine of the immaculate conception, Luke 1:28 would be the strongest verse.”
The scriptures [mainly Luke 1:28] do not give a credible and verifiable testimony to the immaculate conception of Mary as, according to Dr. Sungenis, “What the Church has in the way of credible and verifiable testimony on the immaculate conception is [only] from
oral tradition….”
Blessings,