I haven't shared this with our church yet, but let me give this example:
Billy Graham, many decades ago, gave what I consider to be one of the most powerful presentations on the proper doctrine of repentance that I have ever heard. And yet, I do believe that he is in hell today.
Why?
Because a man can repeat a correct doctrine that he has heard, and not understand it. A man can say one thing, and do another, and that is often the reason why we see so many contradictions in the doctrines of those men. I'm not talking about errors, but flat-out contradictions in their doctrines at different times.
All therefore whatsoever they bid you observe, that observe and do; but do not ye after their works: for they say, and do not.
-Mat 23:3
This is a concept that most churchgoers have a hard time understanding. How can a man preach grace through faith, and not have grace through faith? How can a man preach godly sorrow for sin, but not have godly sorrow for sin? When this is all over, and judgement day comes, we're going to see millions of examples of it.
What then? notwithstanding, every way, whether in pretence, or in truth, Christ is preached; and I therein do rejoice, yea, and will rejoice.
-Phil 1:18