What does "It presupposes that the church is sunk down in a backslidden state, and a revival consists in the return of the chirch from her backsliding, and in the conversion of sinners", mean?

Currently, as of february 2016, an american traveling in france would be by the exchange rate. the weakness of the euro and the strength of the us dollar means that items in france cost less to an american than they otherwise would. of course, if this trend reverses and the us dollar weakens and the euro strengthens, such as was happening in early 2008, an american traveling in france would have an adverse experience because items would cost relatively more.