God is the "alpha and omega, the beginning and the end." He knows all things, for all time. He created Lucifer, and since he knows all things, he knew that Lucifer would rebel. He knew that Lucifer would convince Eve to take a bite out of the forbidden fruit, and yet he put the tree of knowledge there anyways. He knew that he was creating evil, and yet he did it anyways.
That is a quite rational formulation. So, how do you know that god is telling you the truth?