It applies exclusively to atheists. More specifically, deathbed atheists, if I remember correctly. "Hey, why not accept God just I'm case I'm wrong, cover my ass and all." This is an atheist talking. Obviously it is flawed because you can't fake faith, with God knowing your true heart and all.
Was never intended for believers, and had nothing to do with whether their lives were more or less fulfilling than agnostics/atheists. And the dying with hope part was my thought, not Pascal's. Makes complete sense to me, but totally fine if you disagree. No worries.