n. 新入教者, 新信徒, 初学者

[ noun ]
a new convert being taught the principles of Christianity by a catechist
<noun.person>

Catechumen \Cat"e*chu`men\, n. [L. catechumenus, Gr.
kathchoy`menos instructed, from kathchei^n. See {Catechise}.]
(Eccl.)
One who is receiving rudimentary instruction in the doctrines
of Christianity; a neophyte; in the primitive church, one
officially recognized as a Christian, and admitted to
instruction preliminary to admission to full membership in
the church.