1 Corinthians 15:18
For if the dead are not raised, not even Christ has been raised; 17 and if Christ has not been raised, your faith is worthless; you are still in your sins. 18 Then those also who have fallen asleep in Christ have perished
Paul is speaking facetiously here but he makes a point about the dead - those 'fallen asleep', who would perish or 'are lost' (ISV) inferring, it seems, that they are no more and can never be again.
Is Paul teaching, that except for a resurrection, there is no hope for life after death - even if we are Christ's?