With all the speculation about who or what Mystery Babylon is, I decided to do a word study of the word mystery in the Bible.  I was surprised to see that the word mystery is only used in the N. T. and then only 22 times.  19 of those times it is spoken of with positive attributes and the 2 Tim. and Rev. references are prophetic and show negative attributes.  The word mystery is associated with words like treasure of wisdom and knowledge, inheritance, for our and Gods glory.  It has to do with the N. T. Christian being grafted into the Olive Tree after other branches have been cut off......All seems to point to our inheritance in Christ for the ages to come.  Then this Mystery Bablyon appears and if you associate these attributes to this woman who is in a position of regal power -dressed in purple and scarlet, has been in a position to kill the prophets and saint, a harlot.......  Well, look at Ezk. 16 and you will see this same "woman".  Here is woman given inheritance, power, created for their and Gods glory, supposed to be full of wisdom and knowledge...... and it has gone wrong through her harlotry with the world powers.  I agree with Eddie, I see this Mystery Babylon as being the ultimate betrayal by Gods wife (Isreal)  prior to their return to him.  I think with the rebuilding of the new temple, the restoration of temple worship and cooperation with the anti christ, it will bring the world power for a time to Isreal -after the rapture has happened and during atleast the first part of the tribulation. Then complete destruction..... All of this happens to help bring Isreal back to God as a nation and back to their blessed role of wife/co-ruler with God on this earth.  I pray it won't be long before we find out for sure.  Blessings to all....