The Greeks and Romans did not have morality as part of their religion. The “religion” of the Greeks and Romans includes stuff like this:
Zeus takes the form of a swan, and rapes/seduces Leda, the wife of King Tyndareus of Sparta. She bears two children from this, Helen and Polydeuces. Later, at a feast, Zeus is asked to declare which goddess is fairest, among Hera, Athena and Aphrodite. Zeus apparently perceives that he might be in some trouble whatever his answer is, so he asks a Trojan prince, Paris, to judge between them. Paris looks at the three goddesses and declares that he can’t decide with their clothes on. So, the three goddesses get naked before him, and also make promises to Paris if he chooses them. Hera offers to make him king of Europe and Asia. Athena offers her wisdom and skill in war. Aphrodite offers him the world’s most beautiful woman. Paris takes up Aphrodite’s offer. The world’s most beautiful woman is Helen, the half-bird girl, who is now married to Menelaus, King of Sparta. Paris goes to Sparta and (with Aphrodite’s assistance) “rapes” (seduces) Helen, who goes off to Troy with Paris. This begins the nine-year Trojan War, in which Troy is reduced to ashes, and its citizens slaughtered. Aeneas, prince of Troy, escapes the burning city, wanders the Mediterranean for a while, and eventually ends up in Italy, where he founds the city of Rome.
Leda and the Swan. 16th century copy after a lost painting by Michelangelo.
From this, you can get an idea of why Christianity replaced this pagan gobbledygook in the fourth century.
Because the Greek/Roman religion was so inadequate for an advanced civilization, the morality of Greece and Rome was often found among the philosophers, which did not have much connection to religion. However, in the Christian tradition, the morality of the society is integrated into the teachings of the Church. As Church involvement has declined, this has left many young women today, and also their mothers, without much guidance.
This is an introduction to a short new book by Lori Alexander, called Biblical Womanhood — a Study Guide. It is only $1.95 in Kindle version.