Jesus prayed to God “not my will, but yours, be done” because Jesus and God have separate wills (Luke 22:42; John 5:30). They would have one will if Jesus and the Father are the same “one God.” Trinitarian doctrine claims that Luke is referring to the human will of Jesus, and not his divine will, but that is problematic because the Bible never says anything like that or even hints that Jesus had two wills in conflict with each other inside him allowing one to be human and the other to be divine.
The Bible says Jesus is an “heir” of God (Hebrew 1:2), and a “joint-heir” with us (Romans 8:17). But if Christ is a co-eternal “Person” in the “Godhead” then he cannot be an heir “of God” because being God would put him into a position to be a full owner of everything and that would mean there would be nothing he could “inherit” which is why Jesus cannot be God and an heir of God at the same time. The Bible says that Jesus Christ is the “image of God” Colossians 1:15; 2 Corinthians 4:4). If Christ is the image of God, then he cannot be God because a person cannot be himself and an image of himself at the same time. Jesus can be called the “image” of God because he always did the will of God, and because he was the image of God is why he could say you had seen the Father if you had seen him.
Ephesians 4:4-6 says there is one God and one Lord and one spirit. This verse teaches exactly what the Jews expected based on the Old Testament and what Jesus, Peter, Paul, and others taught: that there was one God, one Lord, and one spirit of God. 1 Corinthians 8:6 says “for us there is one God, the Father… and one Lord, Jesus Christ.” This simple and straightforward language elucidates that the Father is God and the Son is “Lord” making a clear differentiation between the two.
Jesus reveals Himself as truly God and truly Man at His discretion.
As truly Man, Jesus has a Father, and as truly God, Jesus is God and called "Everlasting Father" (Isaiah 9:6).
Jesus Christ is truly Man (Luke 1:26-33) - the Son of Man, and Jesus Christ is truly God (Luke 1:34-35, John 8:58, John 20:28, John 5:18, John 10:30-31) - the Son of God.
Based on this Truth (John 14:6), Jesus Christ can refer to Himself as Man at his discretion and when He deems it is appropriate.
Furthermore. Jesus Christ can refer to Himself as God at his discretion and when He deems it is appropriate.
Here is an instance of Jesus, truly God, saying "I and the Father are One" (John 10:30) in which Jesus speaks in His capacity of God thus including both the person of Jesus and the person of the Father in the One True God.
Here is another instance, this time of Jesus, truly Man, saying "Stop clinging to Me, for I have not yet ascended to the Father; but go to My brethren and say to them, 'I ascend to My Father and your Father, and My God and your God.'" (John 20:17) in which Jesus speaks in His capacity of Man thus including the person of Jesus and His brothers in one (John 17:21). See, the Son of Man being the firstborn of the born of God persons (Romans 8:29, Colossians 1:15, John 3:3-8).
We, children of God, can also refer to Jesus in his capacity as truly God as well as His capacity as truly Man. We can use context to make the distinction.
We, born of the Holy Spirit of God persons (John 3:3-8), are one in God (John 17:21) because of the indwelling Holy Spirit (John 14:16-17), thus God is One. We are the blessed beneficiaries of the Holy Spirit of God's work in us.
People that do not believe that Jesus is God are not beneficiaries of the Holy Spirit of God.