Ok, I read the whole thing and did try and catch up on comments here but probably missed some so I apologize in advance if I repeat points that were already made. I know quite a bit about the Vinlanders, have studied their group and its affiliates for years, and before I go into detail for the lengthy post: The chance of this being an organized ritual carried out in broad daylight by a Vinlander chapter is zero to none. No way.
The following is why:
Individual Vinlander members have been responsible for murdering other white people, including a white woman who was walking with a Black man on a date. But acts of arbitrary violence by more than one member have historically been against people in the communities they target, usually Black people or other people of color. An individual Vinlander sexually assaulting a white child, even murdering a white child wouldn't be all that surprising. Their ranks, like so many other white supremicist groups, are filled with abusers of every flavor. But their goal is to organize, recruit, build numbers, and further their ideology. Molesting, let alone murdering, white children isn't going to help further those goals, especially when their stated mission is to "stop eradication" of the white race.
Could an individual Vinlander - or more likely someone with similar ideology who spends a lot of time in the online spaces that these groups congregate in and post propaganda to- have carried out these crimes and then marked the scene with iconography associated with white supremicist groups? Absolutely. Could RA have lurked in some of these spaces? It's possible. For every card-carrying member of these groups there's a wide online audience that lurks and absorbs their content. Similar groups on Telegram or Gab might only have 100 actual vetted members but 3,000-5,000 subscribers to their channels.
The iconography that the defense claims was placed on or around the girls bodies is so prevalent on Gab that it's inescapable. "Alt-right" and fascist members often use these symbols in their profile photos and page headers without actually holding membership in heathen/pagan/Odinist neo-nazi groups.
I did also want to point out that a few things are being conflated- the Vinlanders are racist Odinists. Though many (possibly most at this point?) are, not all Odinists are racist. Likewise, some heathen nazis like Vinlanders are church members of the Asatru Folk Assembly, but not all are. And to further clarify, not all Asatru religious groups are racist. Unfortunately the organized arm of the religion has largely been taken over by White Supremicists, but there are long-established Asatru groups that have repeatedly denounced and disavowed the "Folkish" nazi sectors that have sprung up.
Finally- a note on the sacrifice angle. Yes many groups similar to the Vinlanders have violent, disturbing bonding rituals that often include animal sacrifice- usually goats. This is no secret, the groups use imagery from these events in their propaganda videos and still images, and members of slightly more extreme nazi groups (like the Base and Attomwaffen) have seen members sent to jail on animal cruelty charges based on these rituals which should give some indication of the depth of horror they entail. But animal sacrifice, or ritual violence against other human beings who they've repeatedly dehumanized is one thing. Ritual sacrifice of two young white girls by the Vinlanders? Absolutely not.