It really doesn't matter if you know something absolutely or to a certain nonzero degree of accuracy. What matters is whether or not there is an indication of a correlation.
In this case, the question is whether or not there is a god.
To approach this, one must first ask what a god is. Criteria I've seen used are:
- It is a living entity (Non-living natural phenomena are not assumed to be god.)
- An intelligent entity (Meaning it has consciousness)
- A powerful entity (Powerful is a vague, unquantifiable, term, so I will say it is more powerful than other conscious entities. Namely humans.)
Now to address the first criterion, that a god is living.
Living things are complex systems that instigate changes in otherwise homeostatic situations, by acting as a catalyst. The catalytic process is inherently unstable, and the living thing must constantly renew the initial conditions for catalysis. (This is why we breath, eat, reproduce, poop, ect.)
In order for a god to exist it must satisfy this condition of instigating a change that would otherwise be a static environment.
Given that the universe is not static, with many interactions that are still moving towards an equilibrium, there is the allowable possibility that there is a living entity that is involved.
To address the second criterion, that a god is intelligent.
There has yet to be an identifiable cause for intelligence, which makes it impossible to know whether or not this criterion is fulfilled; however it is known that intelligence is a result of numerous complex processes. Alone these processes do not result in anything more than a change in the local static environment, but when combined together they result in a complex cascade of events. The cascade of events is influenced by external phenomena interacting with the system as a whole, while the individual processes are relatively unaffected. (Your brain sends different signals when you see different things, but the way it processes signals is always through neuronal signaling.)
In order for a god to exist, it must fulfill the act of having multiple processes in a sequence that do not change individually, but do have variable progression.
These events do occur in nature. (For instance, cloud systems contain many similar events, where water is evaporated and condensed in a cyclic fashion, yet this cycle does not always occur in the same way, sometimes clouds blow one way, sometimes they blow another, influencing the result of the identical individual processes.)
To address the third criterion, that a god is powerful.
Power is defined as a rate of energy per second, which means that powerful systems are those which occur very rapidly, or with very large amounts of energy.
In order for a god to exist, it must fulfill any act either very rapidly, or on very large scales.
Both of these may be true, as there are many processes that occur rapidly and on large scales in the universe. (Interactions with light is a very fast mechanism, while interactions with planets and galaxies are on grand scales.)
All three of these criteria have the potential of being satisfied by interactions occurring in the universe. There is therefor the possibility of the existence of a god. There may actually be many descriptions that could coincide with the definition of living, some that are a part of a larger whole. (Just like a cell is living, and so is a person, even though the cell can be a part of the human.)
If you take the sum of all processes, the universe is the god.
There is one important thing to realize about the process in the universe though. The average living thing on earth is based on a very unique timescale, with cumulative actions that occur on the order of seconds, minutes, hours, days, and years. Many natural processes do not fit this time, occurring over decades, millions-billions of years or nanoseconds for small events. Thus, if god does exist as a product of these events, any typical living thing would never be able to relate to it, and communication would be impossible. So stop praying, it can't hear you.
None.