Something that goes to the specific topic mentioned - we once had a sermon entitled "The Conservative Case for the Affordable Care Act" presented by a member of our church who has since run for and won a local election as a Republican.
So, I guess my point is, one service doesn't tell you much about any church on the whole.
Also, re: the Republican who gave a sermon on the ACA. That's interesting, but that viewpoint definitely is not the norm among American conservatives. Would an opposing viewpoint have been welcome at your church? Personally, this isn't the kind of topic I want to talk about at a religious/spiritual gathering, but I'm curious.
Regarding your comment that one service doesn't tell me everything about the church: I'm sure you're right.
I can't speak specifically on the UU church, but I belong to a specific religious church that has everything from Progressives and a bunch of ex-Peace Core Jimmy Carter Democrats to Republicans and Libertarians. I know it can be done, and the thing that makes it possible is the loving and supportive atmosphere. I will also say that I've heard a number of sermons I don't personally agree with but fully embrace the people and their motivations.
Our church, and certainly the UU church, would probably take a few sermons before you "got it", about how it's possible to all be together as one spiritual community. We had a former pastor and oil field worker present a sermon one Sunday basically presenting a case study on his wife's and his decisions about how they were generous with their money and how it's possible to be even more giving on a fixed income in retirement. Complete with their partial financial records and plotted over time with major life events. If you were sensitive about money in church, this would definitely have driven you away. But if you knew the couple, and how they were genuinely generous and loving people, it made a lot of sense because the point of it was honest.
The next week we had a reverend who was a chaplain for the Red Cross who worked tragedies like TWA 800, 9/11, etc., talking about how the first responders needed help as much or more than the victims in a lot of instances, and that became a message about how you need to love and take care of yourself when you're helping others. Depending upon the week you were there, they were very different messages that would have been received by people very differently.
If you have a spiritual community who's core tenants you accept and are at peace with, I would give them several weeks before deciding that it's a bad fit based on what you see from the pulpit. There's a lot of changeover and a lot of variance in topics that come with a broad spectrum of views. The atmosphere and the individuals that makeup the community, are really the "meat" of the spiritual meal so to speak. Good people are hard to find. If you're happy with the people you come to know, disagreement with the message form the pulpit even on a normal basis becomes just one aspect for discussion, rather than a principle basis for disagreement.