If you or your particular denomination wish to characterize folks as "Christians" who lived and died before Christ, I suppose that's your business.
Trying to impose your unconventional terminology on others, or berating them for not adopting it, just makes you look silly.
'nuff said.
I am always staggered by Hannah, a mere wife an mother in Isreal, her change of heart in chapter one, and then her prayer in chapter two. What incredible knowledge of God, Biblical theology, and her profound prayer.
Then Hannah prayed and said,
“My heart exults in the Lord;
My horn is exalted in the Lord,
My mouth speaks boldly against
my enemies,
Because I rejoice in Thy
salvation.
“There is no one holy like the
Lord,
Indeed there is no one besides
Thee,
Nor is there any rock like our
God.
That is the Gospel. That is the prayer planted in Hannah’s heart by the Holy Spirit, directed to the God of her salvation—the Lord.
No, she didn’t have “Christian” on her name tag, but it was stamped on her heart.