Tonus-Based on these descriptions and explanations, there is no reason to expect that the afterlife will be pleasant for anyone. We cannot earn heaven.
What is heaven? What is the afterlife? We don't know what these things are...much less begin to assess them as good or bad from a human standpoint. It's true that man tries to understand these things, but they are interpretations at best.
You have no reason to believe that he will treat you in a way that you would define as good, or kind, or merciful. These terms are meaningless when applied to him.
There are plenty of reasons to believe it. Job himself said "will we accept only the good from God?" If it happened as the Bible describes it, since we're going by the Bible, then there's at least a 50/50 chance for "good" in the future.
But even if you were right, that there was zero reason to believe otherwise, what could we do about it? Absolutely nothing.