Firstly, the more difficult questions of OT. Author Paul Copan puts the OT in Ancient Near-Eastern context to begin with, which is a good start.
I reckon, as an example, when we wonder if it was a good thing to test if Abraham would kill his son, we have to remember that child sacrifice was practised by many ANE societies. So in context, God is saying that he demands the same commitment as other gods, but that child sacrifice is not required. So far from being an example of God being unpleasant, this is an example of how God is different, morally superior to what people at that time expected.
This is indeed how Copan deals with much problematic scripture. We have to see it in the context of the other civilisations of the time and their pervading moralities - which were generally much worse places to live. We have examples of other law codes from the time, which compare very unfavourably with the law of Moses. Tom Wright is quoted as saying that Mosaic Law is only temporary anyway - meant for a band of travellers in the wilderness. (sounds like the church).
Copan says we shouldn't necessarily judge ANE societies by our own moral standards. Maybe our morality is deficient in some way. (highly likely)
A corollary of this is that we are making moral Progress (or at least some of us are). Postmillennialism makes more and more sense. Almost as much as amillennialism. But that doesn't make either of them right.
Disappointingly, Copan doesn't ultimately have a good answer for why God seems to command massacres of Canaanites etc. He says that the Canaanites deserved it, God gave them plenty of time to repent, they actually weren't all wiped out anyway, God judged Israel even more harshly, etc.
If your ok with God commanding massacres under certain circumstances, that's fine, and there is other useful material in the book. I'm not, but I've got my wooly liberal cardigan on tonight and wonder about some of those texts.
Oh dear, run out of spac...
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Isaiah 19:23-25 New King James Version (NKJV)
23 In that day there will be a highway from Egypt to Assyria, and the Assyrian will come into Egypt and the Egyptian into Assyria, and the Egyptians will serve with the Assyrians.
24 In that day Israel will be one of three with Egypt and Assyria—a blessing in the midst of the land, 25 whom the LORD of hosts shall bless, saying, “Blessed is Egypt My people, and Assyria the work of My hands, and Israel My inheritance.”
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