the Philadelphia christians, - is not a single church. -  But a special faith  
  
The Philadelphia church in Rev 3: 7-13.v. - is mention as a symbol of clean faith, in the end-time ? - they are not a single Christian church, assemblies, or denominations etc. But single christians through them all, with a clean faith ! 
 
They are a group of single christians, from all Christian churches, organisations and assemblies etc. all around the Earth, - who totally believe in the Holly Scripture, listen to the teachings from the Holly Spirit, and trust in Jesus Christ, as Son of the Living God, and believe in every word of His ! 
  
It is those God talk about in Malachi 3:16-18.v - and Jesus mention in Matthew 8:10-12.v. - John 14:1-3.v. in Luke 12:32.v. and Romans 8th etc.
I believe in, they are those, in Rev 12: 1-5.v. who are called " the male child "  they are the body of christ, and His corronation-wittnesses. Matthev 8: 11.v. John 14: 1-3.v. and Daniel 7: 13-14.v. + 18.v.   - and they in fact are -   " the real firstborn - the first-fruit " - given birth out of all Christian churches worldwide ! 
 
Peace and love be with you all, in the love from our Lord and love,
Jesus Christ, - Marana-tha, ybic, Jan Mikael - jami@paradis.dk 
   

Revelation 3:7-13.v. 
  

3:7 "To the angel of the assembly in Philadelphia write: "He who is holy, he who is true, he who has the key of David, he who opens and no one can shut, and who shuts and no one opens, says these things:

3:8 "I know your works (behold, I have set before you an open door, which no one can shut), that you have a little power, and kept my word, and didn't deny my name.

3:9 Behold, I give of the synagogue of Satan, of those who say they are Jews, and they are not, but lie. Behold, I will make them to come and worship before your feet, and to know that I have loved you.

3:10 Because you kept my command to endure, I also will keep you from the hour of testing, which is to come on the whole world, to test those who dwell on the earth.

3:11 I am coming quickly! Hold firmly that which you have, so that no one takes your crown.

3:12 He who overcomes, I will make him a pillar in the temple of my God, and he will go out from there no more. I will write on him the name of my God, and the name of the city of my God, the new Jerusalem, which comes down out of heaven from my God, and my own new name.

3:13 He who has an ear, let him hear what the Spirit says to the assemblies.