Well, it's just as I said. Trinitarians don't hold a monopoly on their belief in the deity of Jesus. There is Oneness theology, there is Binitarianism, there is Modalism, there is Social Trinitarianism, and there are probably miscellaneous flavors of all of those and other theologies/schools of thought about Jesus' perceived deity.
The Bible also doesn't really say Jesus is God. There are the Jews (Jesus included) who don't believe that and they predate the Trinitarians by millenia. There were Jewish converts, the Ebionites, and Arians who were also non-Trinitarians in the early church.