Why am I a Unitarian Universalist? Because the truth is bigger than any man, woman, church, or tradition.
The Unitarian Universalists respect this.
Nothing herein shall be deemed to infringe upon the individual freedom of belief which is inherent in the Universalist and Unitarian heritages or to conflict with any statement of purpose, covenant, or bond of union used by any congregation unless such is used as a creedal test. – Bylaws and Rules
That is why there are Atheists, Agnostics, Buddhists, Christians, Neo-Pagans, Hindus, Humanists, Jewish, Muslims, and others who are Unitarian Universalists.
One of the sources that UU congregations affirm and promote is:
Wisdom from the world’s religions which inspires us in our ethical and spiritual life. – Bylaws and Rules
For me, that is Buddhism, Christianity, Confucianism, Daoism, Epicureanism, Existentialism, Humanism, Jainism, Paganism, and Stoicism.