metatheologian
/ˌmɛtəθiːəˈləʊdʒ(ə)n/ /ˌmɛtəθiːəˈləʊdʒɪən/rare
noun
A person who engages in, or is an expert in, metatheology.
Origin
1960s; earliest use found in Philosophy: the journal of the British Institute of Philosophy. From meta- + theologian, after metatheology.