I just heard an apologist on STR claim that the degree of unity we see among believers is the degree to which we can conclude that Jesus was divine.
He cited John 17:21-23.
…(21) that all of them may be one, as You, Father, are in Me, and I am in You. May they also be in Us, so that the world may believe that You sent Me. (22) I have given them the glory You gave Me, so that they may be one as We are one — (23) I in them and You in Me—that they may be perfectly united, so that the world may know that You sent Me and have loved them just as You have loved Me.…
I completely agree. Kudos to this apologist for putting a popperian proposition out there.
The non-trivial disunity among believers is, in fact, substantial evidence against the divinity of Jesus, based on its own standards of evidence.