Free will is one of the most notable of the qualities endowed in man by God during the creation. It essentially allows man to be the first cause of a new chain of cause and effect, which isolates God from moral responsibility for the resulting consequences.
Man has free will in order to decide whether or not to worship God, whether or not to accept God's message, whether or not to live by the Commandments, whether or not to accept Jesus Christ as their Saviour - in the end, whether or not to redeem their immortal soul by submitting to the Lord and accepting His Way.
Some people – "incompatibilists" – claim that determinism and free will are logically exclusive (incompatible); although they disagree on whether one or the other (or neither) is more likely to be true. Other people – "compatibilists" – claim that determinism and free will are not logically exclusive; although they may disagree about whether either one (or both) is more likely to be true.
Some incompatibilists, such as those who follow John Calvin's theology, believe in predestination and do not believe that man has a completely free will. Other incompatibilists, such as those who follow John E. Sanders's theology, believe that man has a free will and do not believe that God has completely perfect foreknowledge.
Some compatibilists, such as those who follow John Wesley's theology and David Hunt's theology, believe that man does have a free will, and yet God also has perfect foreknowledge of which choices a man will make.