Judaizer

noun

Ju·​da·​iz·​er -ˌīzə(r) 

plural -s

1

: a Jewish Christian of the apostolic age who attempted to enforce conformity by all Christians to the precepts and practices of Judaism

the Judaizers … thought that Gentiles, in order to be Christians, should be circumcised

—J. W. Hunkin

2

: a member of an heretical group arising in the Russian Orthodox Church in the 15th century and favoring an increased emphasis upon the doctrines and rituals of Judaism

the Judaizers conducted a campaign of subversive activity within the church

—Serge Bolshakoff

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