I wrote about this topic about a year and a half ago here. I somewhat sided in opposition to open theism I think (the side of more pre-determinism). It wasn't the side that really felt right, but logically it made more sense (a bit complicated, but logical). After reading a review of God of the Possible (Greg Boyd) by Jeremy Jernigan, I am reconsidering my view.
My rambling thoughts on the topic (which may be repeated thoughts from the review):
There are many examples of God regretting or changing his mind throughout the Bible. I'm sure these passages have been explained in some way to fit into pre-determinist view, but they are not that straightforward. I've probably read about them, but cannot recall the explanations atm. Why think of these complicated explanations when we can just take the passages at their word?
Also, pre-determinism is mentally exhausting for me. It can make sense to me, but I have to sit in a quiet room w/o distractions for a little while before I have the logic in order. If I don't do this, then I often find myself taking a very superficial view of the topic, which is very damaging. I'll have a difficult time thinking that prayer is important and a difficult time really challenging myself to do things outside of my comfort zone. If God had pre-determined me to do those things, then he would have given me more initiative. I know that is wrong, but that is often where my thought process goes. Anyway, I have always thought that if I believed a theology that put more responsibility on my free will, then I would be more transformed in my everyday activity.
It seems that many Christians quickly react negatively to the future being open or undetermined (even from God's view). I think this is a very good explanation of the idea:
"We might imagine God as something like an infinitely intelligent chess player. I am told that the average novice chess player can think ahead three or four possible moves. If I do A, for example, my opponent may do B, C, or D. I could then do E, F, or G, to which he may respond with H, I, or J. By contrast, some world-class chess masters can anticipate up to thirty combinations of moves. Now consider that God’s perfect knowledge would allow him to anticipate every possible move and every possible combination of moves, together with every possible response he might make to each of them, for every possible agent throughout history. And he would be able to do this from eternity past. Isn’t a God who is able to know perfectly these possibilities wiser than a God who simply foreknows or predetermines one story line that the future will follow?"
Hmm, there are so many cool quotes/ideas in that review. I should read the book. Maybe an idea I would restate and/or add to is that God knows many things will happen in the future and there are some other things (possibly only minor things) that he might not really know what will happen. He gave us this freedom and responsibility in a very similar way to how he gave us the option to have faith in Him. In a similar way to how he gave us dominion over the world, but he oversees us and the greater picture. Throwing those comparisons out there, but probably need to reflect on them a bit more.