We need to realize that the scriptures are written by men for men. God wants to communicate with man in a way that man understands . We know he does not have wings or hands or feet to walk in the garden. Those anthropomorphisms are there so man can relate to God and have an understanding of him.
So, do you believe the scriptures lie about the nature of God? Do you believe that God is not immutable as is taught by the churches as a part of Gods nature?
If God is not faithful to his word, then how do you know the promise of salvation will hold?
Consider this. God chose the means of salvation and the line of the Messiah before the foundations of the world.. Being omniscient would he not have foreseen that all but Moses in that line would be destroyed... is Moses mentioned in the genealogy of Jesus ?
Do you also deny the Foreknowledge of God?
lets try the scripture again
Mal 3:6 For I [am] the LORD, I change not; therefore ye sons of Jacob are not consumed.
Num 23:19 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?
God is faithful to all His covenants
1Sa 15:29 And also the Strength of Israel will not lie nor repent: </for he [is] not a man, that he should repent. Hbr 6:18 That by two immutable things, in which [it was] impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us:
Hbr 13:8 Jesus Christ the same yesterday, and to day, and for ever
(So the line could not have been changed )
Jam 1:17 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.
KJAM if God is mutable and changes , why would you believe the promise of salvation?
There's your first mistake. I believe the scriptures were written by God and that he used men to pen them. I don't believe they were authored by men.
2ndly... I'll address your text when you address mine. The bible says clearly that God changed his mind at the request of Moses. Now you can twist that all you want, you can claim that the text was written by men, you can rationalize it away by asking me why I would then believe in the promise of salvation.... and whatever else you want to say.... the THE BIBLE SAYS GOD CHANGED HIS MIND.
There was a bumper sticker that was popular a few years back. Well, probably not popular with the calvinists.... but it simply said... "Prayer Changes Things". I believe it changes more than just our relationship with God.