I did a search and found a post which listed 19 church shootings in the last 12 years (1999 - 2010). I edited out the details and just kept the dates and municipalities. In most shootings there were multiple murders.
February 14, 2010 - Richmond, CA
March 8, 2009 - Maryville, Illinois
July 27, 2008 - Knoxville, TN
Dec. 9, 2007 - Colorado; 2 shootings same day one in Denver and one Colorado Springs
May 20, 2007 - Moscow, Idaho
Aug. 12, 2007 - Neosho, Missouri
May 21, 2006 - Baton Rouge, LA
Feb. 26, 2006 - Detroit, Michigan
April 9, 2005 - College Park, GA
March 12, 2005 - Brookfield, Wisconsin
July 30, 2005 - College Park, Georgia
Dec. 17, 2004, Garden Grove, CA
Oct. 5, 2003 - Atlanta, Georgia
June 10, 2002 - Conception, Missouri
March 12, 2002 - Lynbrook, New York
May 18, 2001 - Hopkinsville, KY
Sept. 15, 1999 - Fort Worth, Texas
April 15, 1999 - Salt Lake City, Utah
http://www.defensivecarry.com/forum...ch-shootings-11-years-comprehensive-list.html
This would seem to indicate that church shootings are not insignificant. How useful statistics are in predicting the threat you might face on any given day is beyond me. It is as easy to carry a concealed weapon in to a church as in to a grocery store.
Training would have to deal with the difficulties of many innocent people in the building, potential hostage situations, hostages as shields, the high probability that any round fired which missed the target would hit an innocent, the imperative to end the assailants continuing shooting of innocent people . . . (certainly not a complete list of challenges).
A bad situation which could be made worse by poor decisions of good people, or the inability of being able to respond in a defensive manner because firearms are denied to law abiding individuals.