The notion of life after death does a huge amount of harm, actually. First, it's a lie. Second, religions use it as a blunt instrument of control over their flocks, imposing conditionality on it by inventing heaven and hell, reward or punishment contingent on the right kind of behaviour here on earth - behaviour as defined by the religion. It wouldn't be so bad if that "right kind of behaviour" was always part of some agreed universal moral code, but it isn't. You won't be getting to heaven anytime soon if you make so bold as to practise your homosexuality, for example. Finally, it's a massive conceit. You're already a winner by virtue of having made it on to planet Earth in the first place. The chance of you being you, what with the lottery of trillions of possible permutations of eggs and sperms, was vanishingly small, yet here you are. But that isn't good enough for you. You want exquisite eternal life on top! Well bugger off. You're having your go right now, right here. Give it your best shot, be nice to others and be satisfied with it. And enjoy life sans sword of Damocles!