Your argument is that all doesn't mean all. Here's an explanation that was provided.
1 Corinthians 15:22
For as in Adam all die, so in Christ all will be made alive.
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This is essentially a conditional statement.
It is upon the basis that all die in Adam that all also are made alive in Christ. Or better, if all had not died in Adam, then there would have been no need to make all (or any) alive in Christ.
If all died in Adam, then all are made alive in Christ.
The same set of people are being referenced in both the antecedent and the consequent. So, if "all" doesn't mean all in the consequent, then it doesn't mean all in the antecedent.
Modus tollens: If all are not made alive in Christ, then all did not die in Adam.
But, of course, all did die in Adam (according to the fans of eternal torment).
Therefore, all means all in both instances.
1 Corinthians 15:22
For as in Adam all die, so in Christ all will be made alive.
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Focus on what alive and dead mean. Start there. If there's anyone who believes that "all" means all-- it's me.