This question has been added to this site in response to a man on Twitter
Our Answer: Since the fall of man, the basis of salvation has always been the death of Christ. No one, either prior to the cross or since the cross, would ever be saved without that one pivotal event in the history of the world. Christ’s death paid the penalty for past sins of Old Testament saints and future sins of New Testament saints.
The requirement for salvation has always been faith. The object of one’s faith for salvation has always been God. The psalmist wrote, “Blessed are all they that put their trust in him” (Psalm 2:12). Genesis 15:6 tells us that Abraham believed God and that was enough for God to credit it to him for righteousness (see also Romans 4:3-8). The Old Testament sacrificial system did not take away sin, as Hebrews 10:1-10 clearly teaches. It did, however, point to the day when the Son of God would shed His blood for the sinful human race.
What has changed through the ages is the content of a believer’s faith. God’s requirement of what must be believed is based on the amount of revelation He has given mankind up to that time. This is called progressive revelation. Adam believed the promise God gave in Genesis 3:15 that the Seed of the woman would conquer Satan. Adam believed Him, demonstrated by the name he gave Eve (v. 20) and the Lord indicated His acceptance immediately by covering them with coats of skin (v. 21). At that point that is all Adam knew, but he believed it.
Abraham believed God according to the promises and new revelation God gave him in Genesis 12 and 15. Prior to Moses, no Scripture was written, but mankind was responsible for what God had revealed. Throughout the Old Testament, believers came to salvation because they believed that God would someday take care of their sin problem. Today, we look back, believing that He has already taken care of our sins on the cross (John 3:16; Hebrews 9:28).
What about believers in Christ’s day, prior to the cross and resurrection? What did they believe? Did they understand the full picture of Christ dying on a cross for their sins? Late in His ministry, “From that time forth began Jesus to shew unto his disciples, how that he must go unto Jerusalem, and suffer many things of the elders and chief priests and scribes, and be killed, and be raised again the third day.” (Matthew 16:21). What was the reaction of His disciples to this message? “Then Peter took him, and began to rebuke him, saying, Be it far from thee, Lord: this shall not be unto thee.’” Peter and the other disciples did not know the full truth, yet they were saved because they believed that God would take care of their sin problem. They didn’t exactly know how He would accomplish that, any more than Adam, Abraham, Moses, or David knew how, but they believed God.
Today, we have more revelation than the people living before the resurrection of Christ; we know the full picture. “ God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets, Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things, by whom also he made the worlds;” (Hebrews 1:1-2). Our salvation is still based on the death of Christ, our faith is still the requirement for salvation, and the object of our faith is still God. Today, for us, the content of our faith is that Jesus Christ died for our sins, He was buried, and He rose the third day (1 Corinthians 15:3-4).
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