...a simple answer.
Perhaps a term of convenience when one does not want to get into a lengthy explanation. I don't usually use the word religion, and don't typically speak of "going to church," as the phrase brings up negative connotations for me. I talk about going to the UU service.
I more often hear terms such as "spiritual community" used when referring to UUs.
After nearly 40 years of doing nothing that could be remotely considered as belonging to a group that dealt with spiritual matters, I happened upon this small group of people. I found so many admirable folks who passionately and actively support a variety of causes that I feel are worthwhile - caring for the planet and the people who inhabit it, speaking out against injustice and discrimination, involvement with local shelters and food pantries, donating to organizations that make small business loans to people around the world to give them a leg up toward becoming successful in their various enterprises. Lots more.
Our building is made from reclaimed barn wood. There are solar panels on the roof. We use paper products made from recycled paper.
It is refreshing to find a group of people who I know have values that I share, right from the outset. I live in a very red county in Illinois, and generally keep my mouth shut about a lot of things when talking to neighbors because they are pretty certain to be politically conservative. In the UU congregation, I know I am among like-minded liberals and progressives.
I have developed a new skill - I am a member of the handbell choir, which is a delight.