Why do we exist???

Sometimes I feel if it was all coincidence. The simple sequences of A,G,T,C (in DNA) often confuse me. It always have been exciting to think about these things. How could these small repeated sequences give us our own and only unique identity? Sometimes when I think about the origin of all these things I myself feel that there have been too much coincidences. This feeling often drives me to the supreme being called 'GOD'. Was it GOD? Is he really present? Again I have another feeling which often questions me. Is it possible that our science is not enough to explain these things? I mean you could only guess various things but they might not be correct yet gives enough reason to consider it as a possibility. But we should also consider evolution was result of millions of years. From lower to higher organisms , from simplicity to complexity, from some simple possibilities to a unique selection. Let us take the DNA. I can say that this thing excites me every single day. A simple array to the most complex expressions and development. These things often make me sleep. Really I don't understand much about these stuff. But the complexity it shows often asks me to look beyond miracles of all degrees. What I feel everyday we can only be thankful to the supreme whether it is a genesis or GOD we can only be thankful. I think the state of existence was just a chance not a prescribed process. After huge trials of nature and its components the given time permitted our existence. Whether I believe GOD or not it really doesn't matter but I can believe in the evolution and nature and of course the genesis which is still existent today. Let us think about the  Levinthal's Paradox, how a simple reasonable argument transformed the protein folding into a process but not into a chance mechanism. I sometimes feel like this mystery of protein folding our origin has a similar mystery. I speak of life as an unknown phenomenon which could have been originated through chance alone. And after these chances the genesis became a phenomenon. Let us think of a monkey which is given a set of 10000 letters. Now we instruct it to rearrange them to make a simple meaningful essay. Given enough time to the monkey it might solve the problem. There is always a possibility. How does it do? Let go of the monkey problem. Think of yourself when you were a small child even building a sentence was a tough ask. What about now? Now you can easily build huge stories, essays and what not. Do you now feel that what might be the phenomenon of this genesis? I mean to say the monkey starts randomly and by chance alone it may create a word. After sometime he makes another word. And through these chances the process of selection of letters after letters and words after words might evolve into a meaningful essay. Do you think Nature played the same gamble? I think may be. What we think as a coincidence might have been an array of related processes that Nature might have tried to connect. But then the question comes 'why'. What was the initiator ? At least I don't know.....