The writer of Hebrews clearly believed that the Son was fully divine, but a distinct person from the Father, both being YHWH. The writer of John and Colossians shared the same view.
Other writings in the New Testament reflect different theologies. For the writer of Mark, Jesus was a fully human messiah with human parents adopted as the son of God. The writers of Matthew and Luke introduced the idea of the virgin birth, of Jesus not having a human father, thus being God's son because God miraculously causes his birth.