" as much as they need having rigid rules in place in which to define the parameters of Christian behavior."  

Yes, this is so true because they define the Christian by behaviors, not motivation or attitude.  Jesus taught attitudes, not behavior.  We are to be forgiving and loving, and as gentle as doves but wise as serpents.   The behavior that flows from those attitudes will please His Father and bring us to the Kingdom.  Constantly worrying over 'right behavior' is fourth grad Parochial school stuff.