You guys keep pushing this "according to Protestants, God is a slave to His plan so He cannot be omnipotent" thing. Of course we're not saying that. Look at it this way:
Forest: Hey Cronos, does God keep all of His promises?
Cronos: Well yes, of course.
Forest: Therefore God is a slave to His own promises, isn't He? He doesn't have the power to change His mind, does He? You don't think God is all powerful, etc. and blah blah blah..
You would correctly point out that God keeping His promises is no restriction on His power. It is not what God CAN do, it is what He WILL do. It is the same with His plan. God is not restricted, in power, in any way.
agian, the problem is that the umbrella term protestant covers so many conflicting points of view: would you say arminians, southern baptists, high anglicans, weslayans etc have the same dogma?