God is unchanging. In Christ He is fully God, and fully Man. Christ is preexistent. Was His body created, and is He still human in heaven?

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"Include all the information someone would need to answer your question." I’m, uh, asking it cause I’m not sure of the answer? John 8:58 reads "Jesus said to them, “Truly, truly, I say to you, before Abraham was, I am." I believe in the infallibility of Scripture, and that Christ is coequal to the Father and the Spirit. That all three persons are eternal, and fully embody the attributes of God, and they together are God.
The difficulty is that if Christ’s body was created, and He is in heaven in a resurrected body, then has God changed?
A possibility I’m working through is that the title "Son of Man" is descriptive, and that Christ is bound to humanity by His own will. That Christ was always, and has always, been sacrificed in time on the Cross. This is a particular reading from Revelation 13:8, which says He was slain "From the founding of the earth."