convert

convert verb [ I,T ] uk/kənˈvɜːt/ us convert verb [I, T]
(CHANGE RELIGION)

to change to a new religion, belief, etc, or to make someone do this

обращать(ся) (в другую веру)
When did he convert to Islam?

CONVERT noun

[ C ] uk/ˈkɒnvɜːt/ us
someone who has been persuaded to change to a different religion or belief

новообращенный
a Catholic convert