As other answers have noted, while whole pagan belief systems did not survive, many pagan beliefs became absorbed into Medieval Christianity. read more
If your question means “why were there (still) pagans in the middle ages” it can be answered. I am not sure what “believing in paganism” should mean. It is obvious, that conversion to Christians was not really attractive for some European groups. Charlemagne (who indeed was a bigot Christian), wanted to subjugate the Saxons. read more
Witchcraft in the Middle Ages was a controversial crime that was equally punishable to poisoning. If one was accused of witchcraft, the charges could be dropped by a relative’s defense in a trial by combat, or by twelve people swearing an oath of the accused’s innocence. read more
Pagans did not believe in heaven or hell, but did believe in reincarnation. There were many different kinds of pagan religions, but my main topic is of pagan religions in the middle-ages. There are vast amounts of different pagan religions/traditions some basic and more popular ones are the Celtic, Druid, Greek, and Witchcraft. read more