If Jacob, whose name God changed to be called Israel, represents spiritual Israel, Then, according to Jeremiah 2:4, would not spiritual Israel be the ones that were backsliding?
Would you agree that Jacob is one of the elect? Rom 8:33-39, nothing will separate his elect from the love of God.
When the born again elect of God commits a sin we separate ourselves from fellowship with God until we repent. Does God divorce us each time we commit adultery with the world?
[Heb 1:3 KJV]
3 Who being the brightness of [his] glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high;
[Heb 12:5-8 KJV]
5 And ye have forgotten the exhortation which speaketh unto you as unto children, My son, despise not thou the chastening of the Lord, nor faint when thou art rebuked of him:
6 For whom the Lord loveth he chasteneth, and scourgeth every son whom he receiveth.
7 If ye endure chastening, God dealeth with you as with sons; for what son is he whom the father chasteneth not?
8 But if ye be without chastisement, whereof all are partakers, then are ye bastards, and not sons.