It is clear in Rom 5:19 that the "many" who were constituted sinners is the same "many"
that will be made righteous. When scripture uses the word "all" you still reject that it really
means "all". So if Paul had used the word "all" here, you would still deny that Christ will save
all of mankind.
Ephesians 3
2 Surely you have heard about the administration of God’s grace that was given to me for you,
3
that is, the mystery made known to me by revelation, as I have already written briefly.
4 In reading this, then, you will be able to understand my insight into the mystery of Christ,
5 which was not made known to people in other generations as it has now been revealed
by the Spirit to God’s holy apostles and prophets.
6
This mystery is that through the gospel the Gentiles are heirs together with Israel,
members together of one body, and sharers together in the promise in Christ Jesus.
When Paul uses the "all" he may be referring to the combination of Jew and Gentile.
Now if we look at
Romans 5:18-19
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18 Therefore, as through one man’s offense judgment came to all men, resulting in
condemnation, even so through one Man’s righteous act the free gift came to all men,
resulting in justification of life.
19 For as by one man’s disobedience many were made sinners, so also by one Man’s
obedience many will be made righteous.
The "all" could very well be understood as Jew and Gentile, perhaps not the "all" in
the whole of mankind. We have to tread carefully Joe, it is not what we prefer the scriptures say.