I never explored Unitarian doctrine and never had much need or desire to, so I’ve never given your question much thought. I don’t know right now.
Some are Trinitarians. Some are not.
Some believe in the divinity of Jesus. Some don't.
Some are Christian. Some aren't.
They can be almost anything---or not.
IOW it is not possible to "know" what Unitarians believe. Any person who purports to is either a liar or arrogantly stupid.
There are believers and unbelievers in all churches.
And I seriously think there are going to be many surprises when the time comes.