Causality is contingent on time, and time is contingent on space, and space is contingent on order, and order is contingent on entropy, and entropy is contingent on time.
Hmmm, I'm not grasping this chain of contingency at all.
I can try to be clearer.
Causality means that event A leads to event B.
These events A and B are separated by time.
Time is only the movement of atoms through space. (It is also relative; the fewer atomic movements, the less time passes.)
We can only compare two (or more) points in space because they have different densities of specific atomic configurations. If two points in space have the exact some atomic configuration, then we would have trouble saying that they are indeed two different points. But, pretty much any two points we can pick in space will have different atomic configurations, and we can be pretty sure of that because they are divided by time as well as space. So, we say that they are *ordered* in such and such a way. (In a singularity, there is no such thing as two different points; every potential atomic configuration exists in the same point; this was the state of the early universe.)
These different atomic configurations are guaranteed to not be the same because energy must be expended to move a configuration into a more ordered state. This means that, while we see the order in one state or another, that order cost the rest of the universe some loss of energy. There is no arguing this; anything opposing this rule violates thermodynamics, which, as we know so far, is not possible to violate. It is called entropy.
Entropy is how we notice ourselves (and all the other atomic configurations in the universe) "moving through" time. If we did not experience entropy, we would have to see everything in an utterly disordered state; a singularity of perfect smoothness and infinite curvature.
Thankfully, we don't have to experience that, but the price we pay for being able to see the universe stretched out through time is the constant loss of energy.
I guess I'm trying to explain existence here, in its most basic terms, but it is kind of difficult if it never really hit you. I can only try to describe the sensation that occurs when I feel myself moving through time, and I do a poor job of it generally. It is hard to find the words.