I thought I would put this coply to another thread as a new topic as it is a valid question:
From what I’ve found of course there will be some continuity in some way. Even though the official end of the Egyptian “religion” (they of course didn’t have a name for it - this is our modern concept) ended when Rome converted to Christianity in 328AD, elements would have remained in society long after.
We know that the Christian Coptics continue with parts of it as they still use various aspects of the language and ritual. Just look them up with the references to Hathor for example.
We know that some traditions still remain in various groups in Africa such as in the Sudan.
What we also know is that the “religion” as it was practiced back then in it’s entirety is gone and all that we can access is fragments.
Where does this leave us re-constructionists? I honestly don’t know.