trinity question 1

wiki definition of the trinity:

The Christian doctrine of the Trinity teaches the unity of Father, Son, and Holy Spirit as three persons in one Godhead.[1] The doctrine states that God is the Triune God, existing as three persons, or in the Greek hypostases,[2] but one being.[3] Each of the persons is understood as having the one identical essence or nature, not merely similar natures. Since the beginning of the third century[4] the doctrine of the Trinity has been stated as "the one God exists in three Persons and one substance, Father, Son, and Holy Spirit."[5] Trinitarianism, belief in the Trinity, is a mark of Oriental and Eastern Orthodoxy, Roman Catholicism and all the mainstream traditions arising from the Protestant Reformation, such as Anglicanism, Lutheranism and Presbyterianism. The Oxford Dictionary of the Christian Church describes the Trinity as "the central dogma of Christian theology".[5]

OK. So, before Mary was impregnated with Jesus, we can presume that the Jesus part of the trinity was spirit only, with no bodily form? then for 30 odd years he had a bodily form as well as a spiritual aspect as part of the trinity? And then he "died" (another question we'll get to) and was resurrected? And now his form is what? Spiritual only? Spiritual and bodily? Does he exist in heaven in a bodily form?

It seems that the triune God had at least three different states: pre-birth spiritual only, "life of Jesus" spirit and body, and post resurrection something.

The nature of God has changed through history? The trinity is not permanent or stable? Is that what christians believe?

That's my question.