Those verses, as requested, to be presented in context of the full passage, that which proves your claims about , "God's unchangeable decree....", are not what was requested of you.“God is not a man, that he should lie; Neither the son of man, that he should repent: Hath he said, and shall he not do it? Or hath he spoken, and shall he not make it good?” Numbers 23:19 (KJV 1900)
“Every good gift and every perfect gift is from above, and cometh down from the Father of lights, with whom is no variableness, neither shadow of turning.” James 1:17 (KJV 1900)
“It is of the LORD’s mercies that we are not consumed, because his compassions fail not.” Lamentations 3:22 (KJV 1900)
“But thou art the same, And thy years shall have no end.” Psalm 102:27 (KJV 1900)
“I will not execute the fierceness of mine anger, I will not return to destroy Ephraim: For I am God, and not man; The Holy One in the midst of thee: And I will not enter into the city.” Hosea 11:9 (KJV 1900)
“And also the Strength of Israel will not lie nor repent: for he is not a man, that he should repent.” 1 Samuel 15:29 (KJV 1900)
“For I am the LORD, I change not; Therefore ye sons of Jacob are not consumed.” Malachi 3:6 (KJV 1900)
Etc., etc.
You are a Calvinist. I think this will help us to understand your what you are about.
You're saying God lied.It was the reason they repented. Are you saying God LIED?