Can Church A Badmouth Church B?

There are four possible scenarios: 
Church A - The church
badmouthing Church B
  Church B - The church suffering
the verbal attack
Scenario Three:  
Church A is not a true church of God and Church B is
This type of attack is prophesied.  The true church will experience hate, condemnation, slander, bitterness and even murder as we enter into the end times.  I would personally hold as suspect any church bringing slander and condemnation against another church.
 
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