To clarify, those churches should not to be confused with your local Church of Christ (without the word "United") which are mostly independent and almost all of which very much push believing in Jesus, loving God and others, and living holy lives.
I grew up in the Congregational Church, one of UCC’s predecessor churches, in the 1950s. Even then, the theology was thin and pale, and did little to inspire. Looking back, it fits the description of trying to make a gallon of lemonade with one lemon. Now, they just imagine the lemon is there. About 10-15 years ago, my youngest daughter was seeking. church she liked, and asked me to take her to a UCC service.
The minister began the sermon talking about going to an Indians game that week, and how he liked the stadium hotdogs. The rest was less memorable; but I did have the awareness at the time to note that nowhere in the sermon was Jesus Christ ever mentioned. A few references to God more or less wanting us to be nice to our neighbor, and that was about it.
Nice building though.
As has to happen, dividing the wheat from the chaff...