Q about arguments for God's existence.

[Esquilax]

One of the most complex codes known to man is DNA, this stores all the information for the growth, functioning and reproduction of all living things

I knew you were going there from the moment you started talking about codes, and the short answer is that yes, you are missing something: "the genetic code" is a layman's analogy used to describe the basics of how DNA works outside of the scientific specifics. It's not a description of what DNA is, it's a comparison for ease of explanation, nothing more.

The reason that DNA is a code is because it can be read as one, it can be "decoded" and rendered in plain English so we can determine what organism might result from it, but this is merely because the chemical reactions that form DNA are predictable and consistent: X DNA structure will result in X organic structure, Y DNA will result in Y structure, and so on and so forth. We know how DNA forms, we understand the limited framework of chemical interactions that go into it, and we can use that knowledge to predict what will happen; it's only four chemicals pairing together, after all.

Simply put, "patterns that can be decoded," is not the same concept as "information intelligently encoded into a pattern." We can, for example, decode patterns in the weather to predict future weather events, but that doesn't mean that weather is a code designed to impart that information to us, just that we've gotten good at recognizing the precipitators of weather events.

Whatever your view on evolution it would seem evident that the DNA code within our cells could not have come about by chance, there must have been an intelligent being to create the code.

In an accurately understood view of evolution, DNA didn't come about by chance; in reality it formed via a lengthy chain of small steps, each one adding slightly to the complexity of the chain over time, like grains of sand added to a pile. Most importantly, none of those small steps, if they survived until now, were random; the survival of each and every one of them was predicated on the environment the resultant organism found itself in, plus the prior steps that led up to that point. In actual fact, there are a multitude of restrictions and frameworks in place around the evolution of human DNA, so calling it random would be a flat out lie; you seem to have fallen for one of creationism's greatest fraudulent claims about evolution, so I have to ask: did you read up on evolution at all before you wrote this?

Also though? The fact that you can't imagine how these things came about by chance is merely an argument from ignorance: "I don't know" does not equal "it's impossible."

And therefore since all life on earth needs DNA to function and reproduce, life itself could not have come about by chance. Proof God exists?!

Life didn't come about by chance. Therefore, your conclusions are faulty, and your proof is... not.