In this article, I will outline the dynamics of social transformations and cultural preservation in the Finnish Pentecostal movement, which are caused and affected by different migrations in the history of the movement. With a history of hundred years, immersed by social and societal transformations, missionaries, new converts and new cultures, the Finnish Pentecostal movement has its own traditions, but nevertheless is constantly facing influences from different cultures. My aim in this article is to analyse the logics of transformation and preservation of Pentecostal religion and culture on a congregational level. I will compare two different migrations, the Karelian evacuation and the international immigration, as well as analyse the differences in acculturation between these groups. The analysis will include not only the language and cultural habits, but also the social situations, structures and the styles that matter in the way Pentecostalism transforms, and how migrant groups are acculturated within the church.