A. The answer to the general question, “Why do people sin?” is that all people have inherited sin and the tendency to sin from Adam. But what about Adam himself? Why did Adam sin? Adam didn’t have a sinful ancestor from which to inherit sin or a sinful nature. Before he sinned, Adam wasn’t a sinner. So, why did he sin?
Q. How did evil appear in the Garden of Eden?
A. There are only three possibilities for how evil appeared in the Garden of Eden. Either 1) God had no intention of evil appearing but it crept in accidentally anyway, 2) God knew that evil might appear but he intentionally took a neutral stance and then came up with a plan depending on what Adam and Eve chose, or 3) God intended evil to appear in the Garden because it served His purpose to glorify His Son.