Theology and Free Will

According to Augustine, and others: 1. God is the creator of everything 2. God is good; and 3. Evil exists.  So, the obvious inconsistency in the combination of the three generates: 4. Something other than God must be the cause of Evil; 5. God gave humans the power of 'free will'; 6. Therefore, humans are the cause of Evil in the world--which, further, suppresses: 5a. Human 'free will' exists.  Now, despite the thorough logical vetting that this argument has received over the centuries, it retains its influence, e. g. the common acceptance of 5a.  Still, the more fundamental challenge to the Theology to which it is essential is its scriptural groundlessness, i. e. there is no literal support for it in the text of Genesis: 2-3, which means that it is no more than an arbitrary theological concoction.