I am not against such, except for the demanding part, for it is not for man to demand, but of God whose commands obedience of mankind. We as Christians are to warn those that disobey the commands of God [Ezekiel 3:18-19] and persuade lost sinners to a Savior (Jesus Christ) which can cleanse them from sin and restore fellowship with God [Luke 14:23].
But our preaching of repentance is not first or only to the lost.
2 Chronicles 7:14:
If my people, which are called by my name, shall humble themselves, and pray, and seek my face, and turn from their wicked ways; then will I hear from heaven, and will forgive their sin, and will heal their land.
We are to repent of sin and live a Christian testimony.
We are to ask, persuade, and pray for brothers and sisters in Christ to repent of sin and live a Christian testimony.
Only then can we go to the lost world and ask them to do that which we honestly believe and do ourselves. We cannot simply use the parent clause, “Do as I say, not as I do.”
Remember Paul says in 1 Corinthians 10:12, Wherefore let him that thinketh he standeth take heed lest he fall.
Even Christians are still sinners, but have been regenerated and now have God working in us to do that which is right. It is not that we are better than they (the lost) are, but that we are better off because of what Christ has done for us.
Maybe if all of us Christians could get our act together the lost world would see the picture of Christ in us that Christ said should be shinning through.
Lets take a moment to examine ourselves as close as we examine the lost person and lets see what God will do through us.