How do you discern if someone has been regenerated or not? I have known professing Christians who occasionally commit certain sins and other Christians say to them, "You are not a Christian. No regenerate person would be doing what you are doing." Those professing Christians insist that they have been changed by Christ, but they are not as sanctified as some other Christians.
Would your answer vary depending on which sin or sins they were committing?
Would your answer vary depending on which sin or sins they were committing?