That is funny, because John 5:18 states that Jesus was on the verge of being put to death for making himself equal with God, which harmonizes perfectly with Phil 2:5-9.
So once again, we are talking about the nature of God, and Trinitarians always maintained that all three share the nature of divinity.
I will deal with Philippians 2 separately, lest this get confused with the above:
Phil. 2
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5] Let this mind be in you, which was also in Christ Jesus:
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6] Who, being in the form of God, thought it not robbery to be equal with God:
Note two things:
First of all, Jesus is not called "God". That title is reserved exclusively for the Father. There is no "God the Father and God the Son", as stated in the Trinitarian doctrine.
Secondly, WE are expected to have the same mind as Jesus in this matter. In other words, WE are to consider ourselves as being in the form of God, and not consider it robbery for us to be equal with God.
We are indeed made in God's image, and have an "equality" with God in the fact that we can approach Him without intermediate, as intimate friends:
John 16
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26] At that day ye shall ask in my name: and I say not unto you, that I will pray the Father for you:
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27]
For the Father himself loveth you, because ye have loved me, and have believed that I came out from God.
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28] I came forth from the Father, and am come into the world: again, I leave the world, and go to the Father.
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29] His disciples said unto him, Lo, now speakest thou plainly, and speakest no proverb.
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30] Now are we sure that thou knowest all things, and needest not that any man should ask thee: by this we believe that thou camest forth from God.
Notice again here, that Jesus is not called God, nor part of a "Godhead". He is described, rather, as a messenger from God, like the angels [though, of course, of a higher status than the angels; for God adopted him as His son].