where is jazz really from? greek? egyptian? arabic? roman? american?

It was brought to Earth by the angel Satchmael, whom Scripture describes as having "...a voice like unto rusted iron".  And when he "blew upon his trumpet, their ears were opened, and the GLORY of GOD was kindled within their hearts".

Jazz is a music genre that originated in the African-American communities of New Orleans, Louisiana, United States, in the late 19th and early 20th centuries, with its roots in blues and ragtime. ... Cool jazz developed near the end of the 1940s, introducing calmer, smoother sounds and long, linear melodic lines.

N e g r o s from the slave era. They started improvising and it morphed into jazz.There is no religion associated with it's inception.

It's from New Orleans.