This behavior surprised God; and he asked what was the cause of this his procedure; and why he, that before delighted in that conversation, did now fly from it, and avoid it. When he made no reply, as conscious to himself that he had transgressed the command of God, God said, "I had before determined about you both, how you might lead a happy life, without any affliction, and care, and vexation of soul; and that all things which might contribute to your enjoyment and pleasure should grow up by my providence, of their own accord, without your own labor and pains-taking; which state of labor and pains-taking would soon bring on old age, and death would not be at any remote distance: but now thou hast abused this my good-will, and hast disobeyed my commands; for thy silence is not the sign of thy virtue, but of thy evil conscience." However, Adam excused his sin, and entreated God not to be angry at him, and laid the blame of what was done upon his wife; and said that he was deceived by her, and thence became an offender; while she again accused the serpent. But God allotted him punishment, because he weakly submitted to the counsel of his wife; and said the ground should not henceforth yield its fruits of its own accord, but that when it should be harassed by their labor, it should bring forth some of its fruits, and refuse to bring forth others. He also made Eve liable to the inconveniency of breeding, and the sharp pains of bringing forth children; and this because she persuaded Adam with the same arguments wherewith the serpent had persuaded her, and had thereby brought him into a calamitous condition. He also deprived the serpent of speech, out of indignation at his malicious disposition towards Adam. Besides this, he inserted poison under his tongue, and made him an enemy to men; and suggested to them, that they should direct their strokes against his head, that being the place wherein lay his mischievous designs towards men, and it being easiest to take vengeance on him, that way. And when he had deprived him of the use of his feet, he made him to go rolling all along, and dragging himself upon the ground. And when God had appointed these penalties for them, he removed Adam and Eve out of the garden into another place. (THE ANTIQUITIES OF THE JEWS, book I)
From the above words of Josephus we may know that Pharisees of the first century believed that Adam was a literal person. So, Paul had to believe it, as shown in his letters.
