Claim. The Trinity is a four-position-foundation formed by God as center plus Jesus and the Holy Spirit as horizontal True-Parent pair. Every Adam-Eve couple united with God was meant to form such a trinity; the Fall produced Satan-centered trinities instead.
Elaboration. Per dp-4-rebirth-and-trinity §4.2: “Jesus and the Holy Spirit stand before God as object partners who separately manifest the dual-characteristics of God. They unite through give and take with each other with God as the center and form the four position foundation. God, Jesus and the Holy Spirit thus become one, and this oneness constitutes the Trinity.”
DP universalizes the pattern: “Originally, God’s purpose for creating Adam and Eve was to form a trinity by raising them to be the True Parents of humankind… centered on God in a four position foundation… Each couple would thus have formed a trinity with God.”
The Fall reversed it: Adam and Eve “formed a four position foundation with Satan as their center… a fallen trinity with Satan.” All descendants inherit this Satan-centered trinity.
Restoration recovers God-centered trinity couple by couple. Resurrected Jesus and the Holy Spirit “could form only a spiritual trinity” — fulfilling the spiritual True-Parent mission only. Physical-trinity completion requires the Second Advent (see dp-jesus-completed-only-spiritual-rebirth-second-advent-needed-for-physical).
The doctrine rejects Nicene homoousios (Trinity is not three persons of one substance — it is God-centered pair within FPF schema) and Chalcedonian hypostatic-union (no two-natures-in-one-person; Jesus is perfected man united with God). Trinity is structural, not ontological.
See also. dp-fall-established-satan-centered-four-position-foundation, dp-four-position-foundation-as-fundamental-goodness