Mackie eliminates the idea of God by attempting to show that God is not omnipotent. Mackie accomplishes this by using an argument of some theists which states that good cannot exist without evil. If this statement is true then that would indicate that there are limitations on what God can do and if there are limitations on God then that would make him human. Mackie solves this by denying that there is a God and saying that evil is due to human free will. This also suggests that if there are limitations in which God must create bad with good then is He really wholly good? So when Mackie eliminated the idea of God's omnipotence he also eliminated the idea that God is wholly good because if God were wholly good then he would not be limited into having to create bad. This concludes the basis of Mackie's argument.
3. The Opposition.
I would like to propose that God is omnipotent, God is wholly good, and yet evil can still exist. We have already defined omnipotent as being all knowing and unlimited authority. In order to show this I would like to present you with an account of this action. First I will present you with an excerpt from the Bible on the account of Noah's ark in which God foretold of the great flood and told Noah to build an ark for his family and for some of the creatures of the earth so that they may not be destroyed.
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And God said unto Noah, The end of all flesh is come before me; for the earth is filled with violence through them; and behold, I will destroy them with the earth. Make thee an ark of gopher wood; rooms shalt thou make in the ark, and shalt pitch it within and without with pitch. And this is the fashion which thou shalt make it of: The length of the ark shall be three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits. A window shalt thou make to the ark, and in a cubit shalt thou finish it above; and the door of the ark shalt thou set in the side thereof; with lower, second, and third stories shalt thou make it.