What I don’t get is why they still want to call themselves Christian. At least the Unitarians don’t do that anymore. If you don’t believe in the virgin birth and don’t believe in the resurrection that means you don’t believe Jesus was God.
The parable of the wheat and the tares.
Plant more tares than wheat and you can destroy the ‘brand’ from within.
I believe that is why they are willing to call themselves Christians ... for now.