Freethinking Upstart

"If the Torah had not been given, we would have learned modesty from the cat, the avoidance of theft from the ant, marital fidelity from the dove, and good manners in marital relations from the rooster, who appeases his mate before having relations with her." Babylonian Talmud Eruvin 100b

Even the Gemara says that the Torah is not THE source of morality. These observations may not be the most accurate, however the point still remains. We can learn morality from nature, no divine book is necessary.