What does it mean to have a will that is determined? And what does it mean to have a will that is dynamic? I think that's the first thing I would ask these people that you were speaking with. It's always a good idea to get a good grasp on the terms used in a discussion, before proceeding in the discussion.

Perhaps the people you were talking to were wondering whether God was *free* with respect to certain actions, meaning that *he could have done otherwise.* God has had choices with more than one option.