I think the Ready to Harvest channel provides objective overviews to Christian denominations, and this recent video provides a quick jargon-free introduction for non-Christians generally, though atheists are noted in the title. Each time I tried to quibble with the content, it was usually because I wanted to argue a point (so not neutrally) or thought there was room for nuance (not the point of a jargon-free introduction.) I would have liked more history, too, but that also would have made the introduction too long.
If I did have to quibble, it would be using a flaming chalice emblem to represent various Unitarian Christianities, which includes Jehovah’s Witnesses and other non-Trinitarians like the “Abrahamic Faith” churches, neither of which Unitarian (Universalist)s would identify as common kin or vice versa. But his point in bringing up the various kinds of Unitarians was to identify majority and minority opinions, and where boundary lines may be drawn. In that spirit, he specifically points out the existence and variant opinions of liberal Christians as a minority opinion through the generations and among Christians today. But — being objective — did include them, and did so fairly. Quite a lot of ground covered in just over 21 minutes.
While you’re al it, he has a 2021 video about the Christian Universalist Association — perhaps the only one I’ve seen from outside the CUA orbit — and while I hate the thumbnail, it pictures figures often mentioned in discussion of Universalism.
Stupid questions: in the literature from Abrahamic Faith groups is sometimes cited that there were contacts between them and the Unitarians (and the Christian Connexion) at least in the first half of the XIX century.
Were there something after?
I spoke to an Abrahamic Faith conference once more than 25 years ago, but I don’t think there’s been much contact otherwise or for many decades.