Christian contacts long predated official royal baptisms. Trade, travel, captivity, mission, and Scandinavian settlement in Christian regions repeatedly exposed people to new rituals and ideas.
Rulers also promoted Christianity because church organisation, literacy, and international alliances could strengthen their power. This does not explain every personal choice; political advantage and religious conviction are not mutually exclusive.
Crosses and Thor’s hammers, changing burials, churches, and rune stones reveal no single sequence everywhere. Old and new forms could coexist, merge, or be used in deliberate competition.
“Conversion” was therefore not an instant switch by an entire population. Rituals, institutions, and memory changed over generations. Many detailed texts about pre-Christian religion were preserved only within this Christian literary culture.