So saying man has free will doesn't absolve God of the responsibility of how his creation turned out.
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God is not responsible for man's sinful nature. God made man; man made himself a sinner. If man were not a responsbile being, God would not have set down precepts for him to follow; nor would God have warned him to do and not to do this, that and the other thing through commandments and otherwise:
Ecclesiasticus 15:14-18 "God made man from the beginning, and left him in the hands of his own counsel. He added His commandments and precepts....He hath set water and fire before thee, stretch forth thy hand to which thou wilt. Before man is life and death; good and evil; that which he shall choose shall be given him."
Our free will has nothing to do with it because God knows the choices we make...he knew what would happen and yet did nothing to prevent the most horrible things in history. ~Zoo
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Let's view this in a simple way....
God made the fly. Being Omniscient, He is able to see where the fly would fly and how its existence would end. But this foreknowledge doesn't mean that God determined beforehand just where the fly would land or caused it to land in a flame. God made man in His Image and Likeness with intelligence and free will, of which the fly is devoid. God was able to see the wars, murders, etc. though He may not be held to have determined or be responsible for them. God did not forecasue the war or murder.
The blame falls squarely upon man; upon his misuse of the power to determine the course he must follow and not upon God. That man has the power of choosing between commiting good and evil is beyond a question of reasonable doubt, for all our domestic, economic, and social relations are based upon that principle. If man were not endowed with free will then he could not merit, as did Saint John, or demerit as did Judas.
God's foreknowledge does not interfere with man's use of his free will. The actions of man do not take place becasue God has foreknowledge of them. Again, the blame lies in man's misuse of GOd's gift of liberty of action, the principle that made man a human being instead of an irresponsible being such as are animals.
St.Augustine says, "God wills all men to be saved, and to come to the knowledge of truth, but not in such a manner as to take away their free will according to the good or bad use of which they will be most justly judged."
Bottom line: We can't blame God who created man to be with Him eternally in Heaven for freely taking the road that leads to perdition.