Also, the critics need to provide an acceptable, objective moral standard by which they can criticize biblical morality.  It is one thing to complain.  It is another to offer a justification for the validity of the complaint.  By what right and by what objective ethical standard do the critics offer moral condemnation against Biblical morals?  This is a serious question that if not answered by the critics, renders the critics’ complaints moot.  After all, you must first have a standard against which to measure good and bad and without a standard, no complaints can be legitimately offered.

quoted from carm.org