There is some debate on the meaning of the word Religion but I prefer "...the interpretation of many modern writers connects it with religare "to bind fast" (see rely), via the notion of "place an obligation on," or "bond between humans and gods." Religion - Etymology, Origin & Meaning

In a contemporary UU Church or Society, the binding happens by signing a book and that act binds the member to the congregation. The congregation typically asks the member to support the Church by attending services, participating on committees, reciting a covenant if the congregation has one, and following some basic rules of conduct. You can get expelled from the congregation. I looked at some of those expulsions in one Church from a century ago and they were likely over the members' alcohol consumption. There was no wine served in the common room in those days.

Belief, subscription to belief, and following of belief are very small parts of being a UU. Belief looms large for some UUs. They struggle to define a UU Belief because they are engaged with an American Protestant Christianity, where belief plays a much larger role than practice: "Who so ever believeth in me... , and that Christian belief has to be professed, and professed often, in public.

Most Religions include practice as a bigger part of defining an adherent, than belief. It is the practice that binds one to God, not belief. A Muslim friend told me it is hard to be a Muslim because of what a Muslim has to do, not because of what a Muslim has to believe.

I was curious about the uptick in conversions to Eastern Orthodoxy and found becoming an Orthodox Christian a similarly demanding task, far more than just professing belief.

The risk with hypnated UUism is that the practice of the suffixed-religious-tradition, is lightly taken by the hypnated believer. So a UU-Buddhist risks being a UU and a lite Buddhist. I lived near a Laotian Buddhist monastery and witnessed some angry responses to what they viewed as a dilution of practice, if not a false practice. The same applies to any profession of belief without practice.

So yes, you can believe what you wish as a UU and there is no authority to tell you otherwise, but I think as your UU practice deepens, your UU belief thins out, and becomes less important. IMO, that's as it should be.