Jesus has 1 religion, not hundreds that claim to be Christian. Most are branches off( 2 Thess 2:3= catholicism.Go read Revelation chapters two and three. Revelation means Prophecy. Not only were those seven letters written to those 1 century churches, and character traits of people, but they represent church eras. The letters are 3-fold. The Philadelphian Church was just this past century and it was the best and will even be protected either by rapture according to pre-tribbers, or on earth. We may even be in the last era of Laodecia where the members are lukewarm.
The Greek word in Revelation translates-congregation, not Church.