So which is it? Is sin necessary in order for there to be love/good? Because if there is no sin and heaven how is there love and freewill? Think about it. Based on your own admission, sin has no reason for existing. Why, then, did god create evil according to Isiah 45:7? "I form the light, and create darkness: I make peace, and create evil: I the LORD do all these things." Even more so, why is a blood sacrifice necessary to forgive you for the sin that god created according to his will?