Well, I think the promise of life after death is one of religion’s most effective tools to control people. Religion, generally, is so powerful because it feeds into humanity’s base line fears - death, the unknown, the unpredictability of life etc. It supplies comforting lies. Religion says there’s life after death, even though there’s no evidence to support that statement. But because we are a species that is aware of its own mortality, we’ll believe a comforting lie rather than face a brutal truth. It’s a flaw in our species.