No weirder than Jeses' s accounts of chasing satanic demons from people he healed. Perhaps you ahe never heard of Legion as spoke of in the bible. Perhaps you need to go check Mark 5:9 and Luke:
"Legion, also known as the Gerasene demon, or translated as Lots, is a demon found in the Christian Bible in Mark 5:9 and Luke 8:30. A parallel version of the story can be found in Matthew 8:28-34, but this version does not contain the name "Legion" and tells of two men, not just one, possessed by a multitude of demons. In the story, Jesus traveled to "the country of the Gadarenes" (Luke 8:37), "the country of the Gergesenes" (Matthew 8:28), or "the region of the Gerasenes" (Mark 5:1) and met a man possessed by an evil spirit, which spoke to Jesus in a conversation. The most commonly quoted version is found in Mark 5:9:
And he asked him, What is thy name? And he answered, saying, My name is Legion: for we are many. (KJV) [it is argued that the phrasing is, "we are legion, for we are many"]
Another version of the quotation is in Luke 8:30:
And Jesus asked him, saying, What is thy name? And he said, Legion: because many devils were entered into him. (KJV)
In some versions of the Bible, the quotation is different: We are mob, for there are so many of us
The demons that comprised Legion were aware of the tremendous power of Jesus, and begged to be spared from being tossed back into the bottomless pit of Hell (none of the words translated Hell in the Bible are used, those being sheol, Gehenna, Haides, tartaros; rather, in Mark 5:10, the Greek word choras is used, translated "country" but more accurately meaning an empty expanse, and in Luke 8:31, the word abyssos is used, meaning a bottomless depth). Jesus instead cast the demons out of the man and, granting their request, allowed them to dwell in a herd of pigs. The pigs then drowned themselves in the Sea of Galilee."