I have found it difficult to accept the idea that God exists outside time in the sense that the past, present, and future are all one big now, for in my mind that would require the future to already exist, and if it already exists, then it was created in all its detail, since it could not have come into existence on its own apart from God. Such an idea that the future already exists would destroy human responsibility or any measure of free will. And it would question whether the present is really the present reality. I usually maintain that God has a perfect knowledge of the present, and His knowledge of the future is due to that knowledge and what He will allow or limit with respect to evil or sin. It may not have importance to us in the everlasting state, but it is only a measurement of relative processes.
Events are successive and linear.
Since God created all things, and he is involved with his creation, his acts are successive and linear and involved with us in the present reality. Some may fear that a atom or molecule could get away from God if he didn't predestine every detail of life, but I don't think we need to worry about that. His knowledge and power is enough. Words such as past and future, before and after, then and next, have no meaning outside of the created realm. We must confess that God exists outside of time.