Which religion professes the Golden Rule?

Answer 1

Quite a number of religions do. Apart from The Bible, the Golden Rule appeared before that in Egyptian religion, in ancient Greece, in China's Taoism and Confucianism, ancient Persian Zoroastrianism (probably the oldest mention) and in India's Tamil religion.

Answer 2

The Golden Rule or ethic of reciprocity is a moral maxim or principle of altruism found in many human cultures and religions, suggesting it may be related to a fundamental human nature.

In one way or another, most religions since the Axial Age have professed the Golden Rule or its converse, the Silver Rule (Do not do unto others that which you do not wish done unto you). The Golden Rule is most popularly associated with Christianity.