There is only "one faith", i.e. one set of doctrines which comprises the true Gospel, and therefore only "one baptism" - the baptism which occurs after believing the "one faith".
Ila kuna "imani moja", yaani orodha ya mafundisho yanayofanya kuwa Injili ya Kweli, na kwa sababu hii tu "ubatizo mmoja" - ubatizo unaotokea baada ya kusadiki "imani moja".