I understand what you're suggesting. Some people have talked about a non-theist concept of God, rejecting many traditional attributes of God, but still thinking there's something out there beyond the physical universe. Not necessarily deist, though that's one model.
But I checked statements by her and Shuck pretty carefully, and they seem to be actual atheists.
I'm willing to accept a range of ideas about God. In some ways I like the Eastern idea that we can't understand God's nature, and can mostly just say negative things about him. But to me whatever you may think of his nature, he spoke through the prophets, and Jesus showed him to us.
I acknowledge that there are people who admire (some of) Jesus' teachings, and think of themselves as his followers, while still being agnostic or atheist. I even see how they can think of themselves as Christian. But I don't think that's a direction the PCUSA wants to go, and my impression is that at the national level the UCC wouldn't either.
I'd rather see that approach pursued by the U-U.