* As many as 100,000 Muslims forced to flee - Amnesty
* Foreign peacekeepers seen as failing to halt violence
* Many attacks seen as reprisals for Seleka's reign (Adds president's quotes, details)
By Serge Leger Kokpakpa
BANGUI, Feb 12 (Reuters) - A top U.N. official warned on Wednesday of "ethnic-religious cleansing" in the Central African Republic, as peacekeepers uncovered a mass ...