The base of this discussion is Professor An-Na`im's belief that the state should be secular (i.e. neutral about religion) and not an enforcer of Shari`a.
First, the state should not commandeer Shari`a because Islam decrees that Muslims practice their religion through personal, voluntary conviction without the influence of state coercion. Additionally, the idea of a secular state is more consistent with Islamic history than the notion of an islamic state that conflates religious and state institutions.
Second, state enforcement of Shari`a undermines the religious authority of Shari`a and leads to possibilities of hypocrisy (nifaq). For example, consider how some Islamic scholars assert that apostasy (heresy) is punishable by death although the Qur'an does not provide any legal punishment for apostasy. Thus, if a state enforced the views of those scholars, then some Muslims may be forced to contradict their own beliefs, violating their personal freedom of religion, and undermining the credibility and coherence of Islam itself.
Contextual Considerations for this Discussion ->
The Future of Shari'a