I am indeed a Trinitarian, although my reasons are different than many advanced by others. It's a banned subject on this site.
You'll notice my comment "if Matt. 3:13-15 is accurate." There's a lot to be said on that subject. Here is a start from Brittanica:
"The author apparently found it to be embarrassing that Jesus received John’s baptism of repentance (why would Jesus have needed it?). Thus, he has John protest against the baptism and claim that Jesus should instead baptize him (Matthew 3:13–17; this objection is not in Mark or Luke). Those verses in Matthew assume that John recognized Jesus as being greater than he, but Matthew later shows John, in prison, sending a message to ask Jesus whether he was “the one who is to come” (Matthew 11:2–6). Those passages make it virtually certain that John baptized Jesus and highly probable that John asked Jesus who he was. John’s protest against baptizing Jesus appears to be Matthew’s creation. In keeping those passages while, in effect, arguing against them, Matthew validates the authenticity of the tradition that John baptized Jesus and later enquired about his true identity."
Jesus - The Jewish religion in the 1st century: Judaism, as the Jewish religion came to be known in the 1st century ce, was based on ancient Israelite religion, shorn of many of its Canaanite characteristics but with the addition of important features from Babylonia and Persia. The Jews differed...
www.britannica.com