The Gift of God !
Eph 2:8
8 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:
Salvation here is the Gift of God, the result of Christ's Offering to the Father, to His Law and Justice. Thats is what the word gift here means. Its not a gift as a present we may offer to give someone for their acceptance or refusal, but it is that Gift that went upon the Altar of God's Law and Justice and was sweet smelling Savor unto God. The word for Gift here is the greek word dōron
and primarily means an offering like here Matt 5:23
23 Therefore if thou bring thy gift to the altar, and there rememberest that thy brother hath ought against thee;
You see, the altar is not offered the gift to see if it will accept it or not ! The altar is not asked to make choice to accept the gift !
Matt 8:4
And Jesus saith unto him, See thou tell no man; but go thy way, shew thyself to the priest, and offer the gift that Moses commanded, for a testimony unto them.
You see, the gift is an Offering , not a make available to see if one will take it or not !
Notice in Hebrews how the word gift is used, the same word as in Eph 2:8 ! Heb 5:1
For every high priest taken from among men is ordained for men in things pertaining to God, that he may offer both gifts and sacrifices for sins:
Heb 8:3-4
3 For every high priest is ordained to offer gifts and sacrifices: wherefore it is of necessity that this man have somewhat also to offer.
4 For if he were on earth, he should not be a priest, seeing that there are priests that offer gifts according to the law:
Heb 9:9
9 Which was a figure for the time then present, in which were offered both gifts and sacrifices, that could not make him that did the service perfect, as pertaining to the conscience;
Heb 11:4
4 By faith Abel offered unto God a more excellent sacrifice than Cain, by which he obtained witness that he was righteous, God testifying of his gifts: and by it he being dead yet speaketh.
After looking at this word and its usage, I am convinced that the Gift of God here in Eph 2:8 is specifically speaking of the Offering of Christ as a Sacrifice.
1 Cor 5:7
Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us:
He was sacrificed to God, to His Law and Justice, and the Results is Salvation by Grace through Faith, it is the Gift of God ! That is Christ's Offering of Himself is the meritorious cause of our Salvation , not anything we did !
Those who deny this and Salvation by Christ's Death alone, they are guilty of defacing Christ and derogates His Sacrifice !
Many adversaries state without shame that Christ's Sacrifice in and of itself accomplished nothing for those He died for, Blasphemy !