Question: was Adam originally without sin?
Next question: was this sinless state sufficient for Adam, who was immortal, to earn or possess the Beatific Vision?
Final question: if this was not sufficient for Adam before he fell, how do you imagine that dying without sin but also without Christ , even if that were possible, would be sufficient to get to Heaven?
Heaven cannot be earned. It is a gift, and that gift begins with the life of the Trinity within us that we obtain through faith and the sacrament of faith. What does it matter if I am spotless and do not know Christ? The most I could hope for would be freedom from the positive punishments of Hell.