GameFreakerZero
The hypest
Deciding that it's pretty likely nothing happens after you die is not brave.
That's debatable and wasn't Dezzuu's point anyway. Dezzuu was explaining that belief in an afterlife stems from a fear of death, not that people who don't believe in one are especially brave.
Although I suppose it could be argued that someone who is able to come to terms with their own eventual non-existence would be somewhat braver than someone who believes in eternal life because they're afraid of not being an eternal being.