What is the consequence if there is no resurrection from the dead?

Paul argues that denying resurrection means Christ is not risen. If Christ is not risen, then preaching is vain and faith is vain. Those who practice Christianity would be most foolish, wasting their time, since there is no life after death.

Les explains that Paul may have been dealing with Sadducees in Corinth, since the Sadducees never believed in resurrection from the dead and rejected it as foolishness. Some Corinthians were saying there is no resurrection. Paul's argument is that if there is no resurrection, then Christ is not risen; and if Christ is not risen, then preaching is vain and faith is vain. Everyone who ascribes to some form of Christianity, if there is no resurrection, is of all people most foolish and wasting their time. Why sit in the pew, sing hymns of the faith, and do all these things if there is no resurrection? It is foolishness. Paul uses this as an argument.

1 Corinthians 15:13

But if there be no resurrection of the dead, then is Christ not risen:

If there is no resurrection from the dead, what does that mean about Christ?

Paul argues that if there is no resurrection from the dead—no life after death—then Christ is not risen. If Christ is not risen, then preaching is vain and faith is also vain, making Christian faithfulness foolish and a waste of time.