When I have asked people if they are born again their response was, " I go to ....thus and such church." I explained to them that church attendance does not save anyone, which led into the gospel message. I don't think I was preaching to the choir. Sadly this is the state of many people who attend churches every week.
John 3:3 "3 Jesus replied, “Truly, truly, I tell you, no one can see the kingdom of God unless he is born again.”
There are many non-believers in the church buildings who think they are going to heaven but will hear these frightening words unless they repent and trust Christ.
Matthew 7: 21-23 "
"21 “Not everyone who says to Me, ‘Lord, Lord,’ will enter the kingdom of heaven, but he who does the will of My Father who is in heaven will enter.
22 Many will say to Me on that day, ‘Lord, Lord, did we not prophesy in Your name, and in Your name cast out demons, and in Your name perform many miracles?’
23 And then I will declare to them, ‘I never knew you; depart from Me, you who practice lawlessness.’"
