I have to agree with amber3291, that this is a song about letting your guard down and letting God in. I think the line of the chorus where she says "nothing can separate us" could be a reference to Romans 8:38-39
"38For I am convinced that neither death nor life, neither angels nor demons, neither the present nor the future, nor any powers, 39neither height nor depth, nor anything else in all creation, will be able to separate us from the love of God that is in Christ Jesus our Lord."
I have to agree with amber3291, that this is a song about letting your guard down and letting God in. I think the line of the chorus where she says "nothing can separate us" could be a reference to Romans 8:38-39