Zion Lutheran Church, Middletown (Frederick County) MD has a cemetery in the back of the church. To my knowledge there are no Seiferts buried there. Patricia Fogle published a book, Frederick County MD Church and Cemetery Records, Zion Lutheran Church, Middletown MD. It is volume 3 of a series of Frederick County church books. It contains baptisms, marriages, burials and deaths. You might want to check that out!