WASHINGTON — The evangelical Christian family that owns Hobby Lobby, the chain of craft stores, made history two weeks ago when the Supreme Court overturned the Obama administration’s mandate that family-owned companies must provide contraceptive coverage to their employees.

Now, the family is looking to build a permanent presence on the Washington landscape, by establishing a sprawling museum dedicated to the Bible — just two blocks south of the National Mall.

The development of a Bible museum has long been a dream of the Oklahoma-based Green family, which has built Hobby Lobby into a $3 billion company in which its religious beliefs infuse every aspect of the business, from the music played in its stores to being closed on Sundays.

But on the heels of the company’s legal victory, the project is raising concern in some quarters that the Greens’ museum could blur the line between educating and evangelizing. Steve Green, president of Hobby Lobby and the son of its founder, has referred to the Bible as “a reliable historical document,” and, as part of the museum project, he is developing a curriculum to “reintroduce this book to this nation.”