Christians : my problem with Christianity, some questions.

[JuliaL]

Julia, one of those promises God made to Israel was that He was going to boot them out of their land (because they were so bad)

That's the point.
Not a very reliable eternal covenant. Looks more like how the US Gov't treated the plains natives... Until the sky falls and the mountain is torn asunder....or until I feel like it, whichever comes first.
And it's not like Ol' Omniscient couldn't see it coming. He's the one that set up the whole system in the first place. No backtalk, no options.
He didn't say, "OK Abraham, I shall make of you a great nation...If that's ok with you?" No, the whole thing was a done deal from the beginning.
Besides
You're assuming the veracity of the text without corroboration. Most likely explanation: post-hoc rationalization by the losers.

As for the great deceiver and God being responsible for his deceptions. Good luck on that one.
You might take it up with Him. If you do that humbly, you will get an answer.

Same as asking the milk bottle: yes, no or not yet. I get better answers from my magic eight ball.