Reconciling 2 Important Verses/Worldly Christians?

{Reconciling 2 Important Verses/Worldly Christians?} Can you explain Matthew 7: 21 vs. Romans 10: 13? Also, how do you spot worldly Christians (1 Corinthians 3:1) from those who are unsaved but have good works (Matthew 7: 22-23)? Shouldn't we have grace for sanctification?