Proseletyzing for a new religion usually requires showing some connection between the old and the new. In that way, the crossover can be touted as voluntary, a needed step where there are no immediate armies of the new religion as backup, to kill the reluctant. The mainland Germanic tribes were subject to the killing approach of Charlemagne: it took time, but it ultimately worked. That was not feasible in Norway or Sweden, so the mythological parallel approach took over. The god sacrificing himself on a tree to achieve a higher goal. Common theme in many religions.
Odin. Odin hung on the Tree of Life, the Tree of the Lives, Yggdrasil, for nine days as a sacrifice so he could learn the secrets of the runes. See http://www.norse-mythology.com/Odin.html
Early representations of the crucifixion story (Christian) maximize the text that the crucifixion took place on a tree. See John references, http://bible.cc/acts/10-39.htm, they hung him on a tree. Use that wording, instead of cross, and the Odin idea of Odin who also hung in a tree, slid right over. Nothing to worry about here, folks, just keep moving. Just the same story. So, see the Swedish cross looking like a tree, with the branches nipped off:
Crucifix incorporating Tree of the Lives motif (Odin suggestion), Husaby Kyrka, Kinnekulle
Yggdrasil. This crucifixion is a fitting representation for this place. The cross as Tree. Tree of Life Yggdrasil. The tree imagery is also at Forshem Kyrka, http://swedenroadways.blogspot.com/2011/05/forshem-kyrka-interior-old-odin-traces.html The rosette at the foot of the tree-cross is a common medieval motif, like a solar cross symbol, but need to focus more on this particular one to figure out what it is.
A Treasure. Kinnekulle as biosphere.
Mount Kinnekulle has been a regional crossroads for shifts not just in religion, but in social and cultural change. Kinnekulle moved from a) as an economic entity, owners and workers, b) to current scientific and flora-fauna and geological interest, and c) to a recreational and hiking center, see http://www5.o.lst.se/projekt/kinnekulle/pdf/kinnekulle_naturskrift_eng.pdf.
Read the vision of a biosphere, see http://vanerkulle.org/vk//images/stories/files//245_BR_NOMINATION_Lake_Vanern_Archipelago_and_Mount_Kinnekulle.pdf
3. Kinnekulle as base for studying old Churches, how they changed.
Churches here have been enough off the beaten track to allow parts untouched, or easily restored. Find wide shifts in how the stories were told. And see the initial vitality in art and representation, turn to rigid Reformation, and then to relaxing back.
A progression of missionaries, from the 9th Century wooden stave churches, and those works did not last; to St. Sigfrid in the 11th Century, stone works, and those did last. The stone church era was decorative, full of art, expression, color, pattern, teaching tools on ceilings and on walls. Then came the Reformation. The colors were painted over in order to get rid of the distracting nonsense. Think Calvin. Concealment meant protection, however, and the works could be restored. Remember art class - the idea of horror vacui. Fear of empty spaces. Fill it all up. See it again now. Regardless of the angle of your head twisting up to see, there is something facing yo.
The dominance of women in early representations in Scandinavia also reflects the far more active leadership role of women in the culture. Big Mary, little bishop. Is that so? Mother earth again.
And for the event: a humble, pained figure. It looks like an Elf Cross at the feet, an indigenous representation, equal sided, in a circle, a talisman against mischief of the Elves. Looking at the photo now, is that Bat shapes? Love it.
Someone later must have protested that the symbolism of the Tree, which evoked Odin and made people feel more at home with this new religion probably, had to be superseded. In came this crucifix: jarring. Who put this here? Greek columns, Baroque alien. Even looks show-off.
Look again at the photograph above, of the Bishop's chair, and the enlargement of the crucifixion.
The figures are in the same poses. But the plain one is more moving than this technicolor plastic. A brochure online for the furnishings and details of the church would be so helpful.