If God is the Creator of all things and evil is a thing, then God is the Creator of evil and He is to be blamed for its existence. No, evil is not a thing but a wrong choice, or the damage done by a wrong choice. Evil is no more a positive thing than blindness is, but it is just as real.
Fundamentals of the Faith: Essays in Christian Apologetics (ed. Ignatius Press, 1988) - ISBN: 9780898702026