Authencity based on origin? Never a very strong argument.
You need to be more specific. What exactly ate you debating in reference to origin or authenticity? Please keep in mind the topic of this thread and the initial question raised as my statements are confined in this particular context which without doubt necessitates discussion of the point of origin of Greek religion.
As a self professed atheist I suggest referencing some well known Athist African historians from which my research and statements are based specifically Dr Ben , Clarke and Johnson . Much of this has also been explained by George G M James in his book Stolen Legacy.