In New Testament times every believer was expected to have been baptised when they were converted.

He who has believed and been baptised shall be saved, but the one who has not believed shall be condemned. (Mark 16:15,16). There is no category of those who have believed but not been baptised.

In his discourses Paul assumes that all those in the churches to which he writes have been baptised (Col 2:12; Rom 6:3). And somewhat less convincingly (1 Cor 1:13).