Y'shua of Nazareth seemed not to have cared much, if at all, for formalities or strict definitions — see his answer, in Luke 10:25-37 [0], to the lawyer's question, what must I do to inherit eternal life? (TL;DR: Love God, love your neighbor — and your neighbor is everyone, even your enemy.)
[0] https://www.biblegateway.com/passage/?search=Luke+10%3A25-37...