The afterlife - stopping us from living in a better world?

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I've read a book called Good Omens many times, but coming here brought it back to me. It follows the 11 years that the Antichrist is on Earth, and one of the things he says makes a lot of sense. When he's speaking to The Metatron and Beezlebub (over the fact that he's refusing to end the world) he says "If you stopped telling people that it was all sorted out when we die, maybe they'd do a better job of making this one better" and it's true. There would be a severe lack of suicide bombers if they didn't think they were going to a nice place afterwards. Religious wars would be a lot softer if the fighters weren't sure they were going to a heaven when they died. You follow me? Thoughts please.