Those promises about the land were CONDITIONAL. See Hebrews 3:19…they could not enter in because of their unbelief….Likewise God also kicked them out of the land various times prior to their destruction in 70 AD and again in 135 AD.
If you would like to hear the Christian explanation of this, Pastor Steven Anderson has a sermon called “Free Palestine” at:
https://archive.org/details/FreePalestinetheIsraeliOccupationInLightOfTheBibleByStevenAnderson
