I do NOT have sources on most of my knowledge.
Had I attempted to memorize both the actual useful data and the sources for them, I would have either needed several times more memory or memorized several times less information.
I have asked you about any sources because I am interested about this subject but I found only vague infos or absurdly fantasy theories (like the Dacians were monotheistic, they were Christians before Christ, etc.)
Personally I do not buy the theory of syncretism in conversion, but it's just my opinion.
On the other hand, the peasantry keep tons of pagan customs and superstitions way up to 21 century... which have little or nothing Christian. Still, I do not believe in associations of gods with saints and such made at large scale. I repeat, I do not have books and armies of historians backing me...
Now, concerning the original question, I do see the surviving Zamolxianism only in context of butterflying the Christianity all together (and Islam).