Large families are no longer economically necessary, nor are they commonly endorsed by social norms, but certain religious faiths continue to extol large families and disapprove of using contraception to limit family size. This illustrates .

culture lag      

Explanation:

In sociology, culture lag was introduced by a sociologist named William F. Ogburn during 1922 in his word associated with social change in regards to original nature and culture. The term "culture lag"  is defined as a process that explains that a particular culture takes enough time to adjust with new "technological innovations" and therefore the social problems that occurs because of this lag.

As per the question, the given statement illustrates "culture lag".