6 He that hath an ear, let him hear what the Spirit saith unto the churches.
7 And to the angel of the church in Philadelphia write; These things saith he that is holy, he that is true, he that hath the key of David, he that openeth, and no man shutteth; and shutteth, and no man openeth;
8 I know thy works: behold, I have set before thee an open door, and no man can shut it: for thou hast a little strength, and hast kept my word, and hast not denied my name. (there's the call to salvation, even at the end)
9 Behold, I will make them of the synagogue of Satan, which say they are Jews, and are not, but do lie; behold, I will make them to come and worship before thy feet, and to know that I have loved thee.
10 Because thou hast kept the word of my patience, I also will keep thee from the hour of temptation, which shall come upon all the world, to try them that dwell upon the earth.
11 Behold, I come quickly: hold that fast which thou hast, that no man take thy crown.
It seems pretty simple and straightforward to me.
A comparative real life, real time example... 
That would make her, figuratively speaking, a member of the synagogue of Satan if it were Indians and not the Jewish nation/people.
Exposure and recognition...I will make them to come and worship before thy feet, and to know that I have loved thee.
JMO, YMMV