Fine. If that were true. I don't believe it is. Dr. Maurice Rawlings, a cardiologist, has written several books about this encounters with death-bed and near-death experiences. Here's a link to some Amazon reviews, pro and con. Now, I've never read Rawlings books so that's not the reason I believe in Hell. I have felt the presence of Jesus which led me to believe the Bible is a true testimony on these things and the Bible describes Hell and a judgement.
Do you remember what it was like before you were born?
I don't remember being an infant either but I certainly was one once. :-)
So even the assumption that there is "nothing" after death is only a guess, not based on knowledge, fact or truth at all.
In other words, those who assert there is only oblivion after death are, well...operating on faith, not knowledge. It is a faith-based assertion.