Well, we don't really have "judgement day" either. And sure someone can use it as a crutch but that's because they're missing the point. It's not that we can willingly do whatever the hell we want and then repent for it with the full willingness to start sinning again right afterwards. The point is to have us genuinely feel bad about what we've done and try to reduce the amount of sin in our lives but at the same time allows for the fact that sin is unavoidable. The slate is wiped clean *IF* you really do repent each year. But it's not a guarantee.