A willingness to call the Virgin Mary Theotokos is an important shibboleth for Christological orthodoxy.
It became - to quote Professor Kattenbusch - the "secular" designation of the adherents of the Reformation, the shibboleth of the "liberal" ecclesiastical and theological tendencies.
The Alexandrians, led by Cyril, stood for the doctrine of the perfect union of two complete natures in one person, and made Novi/cos the shibboleth of orthodoxy.
The Strategic Defense Initiative, or Star Wars, became a shibboleth for Reagan, the believer in Armageddon.
There is no single shibboleth used as a test.
This may be the case with those for whom homophobia has become the shibboleth of orthodoxy.
Whether or no the so-called "fourth formula" (Hahn, § 156) is to be ascribed to a continuation of this synod or to a subsequent but distinct assembly of the same year, its aim is like that of the first three; while repudiating certain Arian formulas it avoids the Athanasian shibboleth "homoousios."