I can't seem to lay my hands on the statistics, but I have them somewhere (a problem I have increasingly) which shows the result of a nationwide poll. The people were asked if they believed there was an eternal life in heaven for believers after death. And they were asked if they believed there was an eternal punishment in hell for the disobedient. I cannot remember the figures but they ran something like 80% who believed in the heaven, while only some 30-40% believed in an eternal hell.
If not for the extreme seriousness of this, those answers might be amusing. But they aren't. I don't know exactly what all this reflects, but there are definitely two things that I see. One is that it shows a very serious ignorance of Biblical teaching. And THAT shows a lack of emphasis on this subject by gospel preachers.
What is the problem here? Are we afraid of offending? Or do we feel that preaching on hell is "scare tactics" and we don't think people ought to be Chistians because they are afraid of hell? Those reasons won't cut it. Jesus taught of an eternal punishment in hell. Do you want to question His wisdom? I certainly don't, and I think hell ought to be taught just as He taught it.
And to be brief, the original Greek word "aiwnio" is used for both heaven's and hell's duration in Matthew 25: 46, Jesus doing the speaking. Which is to say, if there is no eternal punishment, there is no eternal life.