how is a deity that acts over a time-frame (7 days), free from it?
Are the laws of physics bound by reactions in time? Do they change when there is a chemical reaction in one part of space, none in another?
Do they rest after a reaction is complete?
Time being a fundamental physical dimension, the laws of physics inevitably end up being influenced / governed by it.
However, a deity that "creates" over a time-span, is not free from time. In other words, why a 7-day "creation"? A timeless entity can only do so in a flash during which no time can creep.
Your particular religion specifically goes into the details of this drawn-out process of "creation" - detailing how this divinity worked on it - each day is counted out to describe the deity's actions over a time-frame, and not that of a single act's multiple effects over a time-frame. In other words, the deity required the time. If there is a time separation between "letting there be light" and "creating water" - it means that the two acts did not originate at a single moment - and this is important to show that even the deity has time separating its particular actions.
This is just the consequence of assuming the convenience of a timeless frame in juxtaposition with time-based reality.