Why did Orthodox residents leave territories ceded to Sweden after the Peace of Stolbovo?

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Following the Peace of Stolbovo in 1617, Russia ceded Ingermanland and parts of Karelia to the kingdom of Sweden-Finland. The residents of these territories were of the Greek Orthodox faith.12

Many of these Orthodox inhabitants fled to Russia because the Swedish government initiated a policy of forceful conversion to Lutheranism. Those who departed were subsequently replaced by Lutheran Finns.12