An interesting point...
However, since we are saved by grace through faith (Ephesians 2:8-9), and have access by faith into this grace wherein we stand (Romans 5:2), it precludes that those who do not put their faith in Jesus Christ are not recipients of the grace of our Lord.
Jesus said (John 10:9) that we must enter in through the door.
Those who do not enter in through the door will find themselves in outer darkness.
A few verses to ponder:
Mat 7:21, Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
Mat 7:22, Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
Mat 7:23, And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
Mat 25:41, Then shall he say also unto them on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels:
I think also (concerning annihilationism) that if those who are placed in everlasting fire were ever completely burned up, the fire would go out, and would not be everlasting.