答案:The theme of John Milton's epic poem "Paradise Lost" is the Biblical story of the Fall of Man, focusing on the temptation of Adam and Eve by the fallen angel Satan and their subsequent expulsion from the Garden of Eden. The poem explores various themes such as the nature of sin, the conflict between good and evil, the problem of free will versus predestination, and the redemptive qualities of faith and obedience to God. It also delves into Milton's personal religious and political beliefs, including his views on the divine right of kings and the English Civil War.