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Why did pagan Germanic religion survive longest in Iceland, Norway, and Sweden?

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Germanic religion and mythology Battle scenes and ships depicted on a memorial stone from Gotland, Sweden, late 8th century. In the third panel from the top, a warrior is being hanged in a tree as a sacrifice to Odin, whose cult is represented by an eagle and a twisted knot.

Pagan Germanic religion persisted longest in Iceland, Norway, and Sweden primarily due to their geographic isolation and the deep integration of paganism into their social and political structures.12

In these regions, the traditional religion was not merely a set of beliefs but the foundation of the social system, particularly among hereditary landowners. Resistance to Christianity was often tied to political autonomy and the defense of traditional customs.13

Iceland: Conversion was a gradual process influenced by international contact. While the Althingi officially adopted Christianity around 1000 CE, it included legal concessions allowing private practice of pagan rites, which helped preserve traditional elements.1
Norway: The transition was marked by intense conflict. Kings like Olaf I Tryggvason and Olaf II Haraldsson used force to impose the new faith, often clashing with pagan chieftains whose power was rooted in the old order.14
Sweden: Christianization was a slow, decentralized process. Centralized pagan resistance, notably at the temple of Uppsala, remained a significant barrier until the late 11th century.135