Quite the same kind of question perhaps that you are asking...as
below found from rbc.
i bought the idea that people (Old, New Testament or now) are saved
by the same Way - Faith in God.
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Since Old Testament people lived long before Christ's coming, how
could they be saved?
People have always been saved by their faith in God rather than by
merit earned through good works ( Hebrews 11:6 ).
The Bible is clear that Abraham, father of the Jewish people, was
saved by faith. The Scriptures say, "Abraham believed God, and it
was credited to him as righteousness" ( Romans 4:3 ). Although
Abraham didn't know the exact way that God would one day provide a
Savior, he made a profound statement about God's ability to provide
a substitute as he prepared to sacrifice his son Isaac on Mount
Moriah ( Genesis 22:8 ).
The principle of salvation by faith continued under the Mosaic law.
Because no one could perfectly satisfy the law's demands, the law
brought awareness of human sin and helplessness ( Romans 3:9-23;
7:7-14 ; Galatians 3:19-25 ). Its provisions for animal sacrifice
were a further revelation of the seriousness and ugliness of sin.
But the provision for sacrifice also pointed forward to Calvary and
God's provision of grace. David, who lived under the law 1,000
years before Christ, clearly knew the power of God's grace,
experiencing forgiveness and salvation through faith ( Psalm 32:1-5
; Romans 4:6-8 ).
Faith in God always involved confidence that God would somehow
provide for the forgiveness of sins. Faith always anticipated the
coming of Christ and His sacrifice on our behalf. Old Testament
believers offered sacrifices as an expression of their faith. By
themselves, sacrificial offerings could never take away sin. When
they were offered in faith, however, God accepted them because they
pointed to Jesus Christ, the one sacrifice worthy to atone for all
the sins of the world ( Hebrews 10:1-17 ).
