"Because God whispers"

"Being silent means more than just holding your tongue. It means listening for the softest, most subtle sound of all - the sound of the soul. "

We can reject everything else: religion, ideology, all received wisdom. But we cannot escape the necessity of love and compassion....
This, then, is my true religion, my simple faith.  In this sense, there is no need for temple or church, for mosque or synagogue, no need for complicated philosophy, doctrine or dogma. Our own heart, our own mind, is the temple.
The doctrine is compassion. Love for others and respect for their rights and dignity, no matter who or what they are: ultimately these are all we need. So long as we practice these in our daily lives, then no matter if we are learned or unlearned, whether we believe in Buddha or God, or follow some other religion or none at all, as long as we have compassion for others and conduct ourselves with restraint out of a sense of responsibility, there is no doubt we will be happy.