We blame God for evil because we do not understand. When bad things happen to me and my faith is tried, I tend to look to heaven and shake my fist. Intellectually, I know that God is not bringing the evil on me to tempt me. But I'm so distraught and upset that I blame God. God allows me to sin and be tempted by evil because He created me with free will. If He created me with free will and then let there be no chance for evil, what real choice would there ever be to do right? Evil is the opposite of good so, for free will to be possible, we must have both options.