Well, the idea that paganism came down to us as an unbroken religion that became Wicca is false. Even Gerald Gardner has now admitted such. I'm not denying there are aspects of older religions that have survived, but as a full religion, no. (I've studied this for decades as well--I don't know which came first, my interest in ancient paganism or my interest in Salem and the witchcraft craze in Europe, but obviously they are tied together for a lot of people.) Anthropologist Margaret Murray was responsible for the idea of an Old Religion worshipping a god and goddess surviving unbroken through the Middle Ages. It was debunked fairly quickly for an anthropological theory, but it's still held onto desperately in some circles. Also, there's no one Celtic goddess-there are countless Celtic goddesses: each one was different to the Celts, many were tribal and only worshipped in one particular area.(Big hint: if you're looking into reading about paganism and such, ancient and/or modern, avoid any book published by Llewellyn unless it's a novel. They don't fact check nor do they require their authors to do so, leading one author to claim an "ancient Irish potato goddess"--the potato is native to the Americas and didn't make it to Europe until the reign of Elizabeth I.)
As for the women accused in Salem (I don't know about the Litchfield case specifically), with the exception of Tituba, they were all Puritans, and some very respected in the church. The idea that they were secret practitioners of an ancient religion is not true. One of the men hanged in Salem was a reverend (George Burroughs).
As for Elizabeth Howe, I've discovered my line is Howes, not Howe, so I'm left with Dicer and Ingersoll (though I don't think my Ingersolls are directly descended from the Ingersolls who owned the tavern the accusations took place at).