18 So then as through one transgression there resulted condemnation to all men, even so through one act of righteousness there resulted justification of life to all men. 19For as through the one man’s disobedience the many were made sinners, even so through the obedience of the One the many will be made righteous. 20 The Law came in so that the transgression would increase; but where sin increased, grace abounded all the more, 21 so that, as sin reigned in death, even so grace would reign through righteousness to eternal life through Jesus Christ our Lord.
The many will be made righteous, how many is how many? Only through Jesus Christ and if they become part of the New Covenant by faith in His blood. It just seems to me that most people are not saved, so many here can not mean so many people like we think of many as in most people.
The many are only those who actually obtain salvation. Jesus said few find eternal life, but many walk the broad path to destruction. But it is of those few that do, they are considered the many, a multitude as in also a large company.
Few
Matthew 7:13-15 New King James Version (NKJV)
The Narrow Way
13 “Enter by the narrow gate; for wide is the gate and broad is the way that leads to destruction, and there are many who go in by it. 14 [a]Because narrow is the gate and difficult is the way which leads to life, and there are few who find it.
But a large amount of people are those few. The few are to be considered a multitude.
Revelation 7
9 After these things I looked, and behold, a great multitude which no one could number, of all nations, tribes, peoples, and tongues, standing before the throne and before the Lamb, clothed with white robes, with palm branches in their hands, 10 and crying out with a loud voice, saying, “Salvation belongs to our God who sits on the throne, and to the Lamb!” 11 All the angels stood around the throne and the elders and the four living creatures, and fell on their faces before the throne and worshiped God, 12 saying:
“Amen! Blessing and glory and wisdom,
Thanksgiving and honor and power and might,
Be to our God forever and ever.
Amen.”
13 Then one of the elders answered, saying to me, “Who are these arrayed in white robes, and where did they come from?”
14 And I said to him, “Sir, you know.”
So he said to me, “These are the ones who come out of the great tribulation, and washed their robes and made them white in the blood of the Lamb. 15 Therefore they are before the throne of God, and serve Him day and night in His temple. And He who sits on the throne will dwell among them. 16 They shall neither hunger anymore nor thirst anymore; the sun shall not strike them, nor any heat; 17 for the Lamb who is in the midst of the throne will shepherd them and lead them to [c]living fountains of waters. And God will wipe away every tear from their eyes.”