Paula Fredriksen explains that Jesus is distinguished from God in Philippians 2.
The Greek, however, does not quite correspond to the RSV’s English. In Philippians 2, Jesus is not "in the form of the (high) God,” but in the form of "a god." Jesus does not demur from equality with God the Father, but from "god-status" or, closer to Paul's word choice, equality with "a god." The god who exalts Jesus in verse 9, by contrast, is the high god (ho theos, the god), referred to as "God the Father" in verse 11. The conventions of English capitalization - "God" with the upper-case G in all clauses - obscure Paul's Greek. Paul distinguishes between degrees of divinity here. Jesus is not "God."
Paula Fredriksen, (2017). Paul: The Pagans’ Apostle. Yale University Press, page 138.