According to Statista, 85% of Swedes self-identify as either "non-practicing Christians" or "religiously unaffiliated", unlikely they have a bible at home if that's accurate. "Church-attending Christians" come up as 8%, and are likely to have a bible at home. "almost as popular as the Bible" seems, if Statista is right, very likely.

https://www.statista.com/statistics/909409/religious-identif...