The theory denies the immutability of God.
Immutability of God
Consider what thou owest to his immutability. Though thou hast changed a thousand times, he has not changed once; though thou hast shifted thy intentions, and thy will, yet he has not once swerved from his eternal purpose, but still has held thee fast. - Charles Spurgeon [1] The
immutability of God means that God is unchanging. More specifically, "
God is unchanging in his character, will, and covenant promises.
Louis Berkhof's systematic theology text (a
Reformed classic) defines God's immutability as 'that perfection of God by which He does not change in His being, perfections, purposes, or promises.' The
Westminster Shorter Catechism says, 'God is a spirit, whose being, wisdom power, holiness, justice, goodness, and truth are infinite, eternal, and unchangeable." Those things do not change. A number of Scriptures attest to this idea (e.g. Num. 23:19; 1 Sam. 15:29; Ps. 102:26; Mal. 3:6; 2 Tim. 2:13; Heb. 6:17-18; Jam. 1:17)."
[2]
https://www.theopedia.com/immutability-of-god
Theopedia
Open theism
Open theism, also called free will theism and openness theology, is the belief that God does not exercise meticulous control of the universe but leaves it "open" for humans to make significant choices (free will) that impact their relationships with God and others. A corollary of this is that God has not predetermined the future. Open Theists further believe that this would imply that God does not know the future exhaustively. Proponents affirm that God is omniscient, but deny that this means that God knows everything that will happen.
"Our rejection of divine timelessness and our affirmation of dynamic omniscience are the most controversial elements in our proposal and the view of foreknowledge receives the most attention. However the watershed issue in the debate is not whether God has exhaustive definite foreknowledge (EDF) but whether God is ever affected by and responds to what we do. This is the same watershed that divides Calvinism from Arminianism"^[1]^
Open Theists argue that people are created to be in meaningful relationships with God and others and as moral beings must have the ability to make real, responsible choices in their lives. Open Theists argue that this cannot be accomplished as long as God exercises exhaustive control of the universe or predetermines the future because this would remove humanity's free will. The counter point to this is that critics of Open Theism say that if God is not exercising meticulous control of the universe, or does not exhaustively know the future, then this would imply that He is not in control and we are not able to completely trust in God's sovereignty. Furthermore, the question remains, will God actually be able to triumph over evil? Open Theists answer these critiques by noting that while God does not exercise meticulous control, he is "ultimately" in control.
https://www.theopedia.com/open-theism
John Wesley and Arminius would condemn Open theism. In their day it would have been coined Deism.