Pope Benedict XVI prays that the prayer of Jesus in Chapter 17 of John’s Gospel that all the believers will be ONE just as Jesus and the Heavenly Father are ONE.
We are one...We have unity...
All those who are saved by faith without works are united...We are one...
And I suppose those that those that might be saved some day, if they get baptized, eat and drink the flesh and blood of Jesus, etc., etc., are united as well...
Thing is, we could never be united with each other...We'd have to give up our guaranteed salvation to unite with you (and your religion)...