To John H. Armstrong, author of the book, "Your Church is Too Small," and to those who buy into his way of thinking, my response is "Your hell is too small."
What do I mean by that? I mean that you are too quick to assume that people don't need to hear the gospel. You figure, "if they call themselves Christians, who am I to judge?" But in the process you lose the chance to convict them of sin and exhort them to repentance and faith in Christ.
By accepting their Christian professions despite their idolatry or other serious and unrepented-of sin, you are not doing them any favors. You may make a lot of friends for yourself (and that will be your reward) but you are not showing them love.
We love our fellow humans and we don't long for hell to be as large as it is. But on the other hand, we need to be realistic and to keep in mind that there will be many who are now saying "Lord, Lord," who will be there. It's not loving to tell someone with a treatable disease that they are fine, even if they don't want to hear about their disease.
Mr. Armstrong, you may think that my definition of the church is too small, but I'm afraid I must tell you that your definition of hell is too small. If I'm wrong, I've shared the gospel in vain. If you're wrong, you've failed to share the gospel with those who need it. If there's any uncertainty about who is right, I suggest you come over to my side.