And you really think Paul -- an apostle and prophet -- would not have know this, but we had to wait for your revelation? This is what Paul said: To deliver such an one unto Satan for the destruction of the flesh, that the spirit may be saved in the day of the Lord Jesus.
If this person was an unbeliever, there is no way that his spirit (and soul since they are joined together) would be saved. "The day of the Lord Jesus" refers to the Rapture, which means that this person would be among those raptured. As Paul indicated elsewhere Christians who failed to examine themselves before partaking of the Lord's Supper could bring judgment upon themselves also. So this man brought judgment upon himself without losing his salvation, and was clearly not an unbeliever.
If this person was an unbeliever, there is no way that his spirit (and soul since they are joined together) would be saved. "The day of the Lord Jesus" refers to the Rapture, which means that this person would be among those raptured. As Paul indicated elsewhere Christians who failed to examine themselves before partaking of the Lord's Supper could bring judgment upon themselves also. So this man brought judgment upon himself without losing his salvation, and was clearly not an unbeliever.
This would indicate that his spirit was not yet saved while he was committing the sins that Paul said shortly afterward might have the result of the persons committing them not inheriting the kingdom of God (1 Corinthians 6:9-11).