I don't know how likely it is that some gases were arranged so that certain things formed together in such a cohesive way, but the odds have to be astronomically against any such occurrence. Of course, by mathematics there is always that one infinitesimal chance that it could happen. Many people stake their beliefs on that chance. Not only against all odds, but against the laws of nature. That means the disorder or chaos of a system will always increase.
Nature tends toward disorder.
It makes it hard to believe that as one-celled organisms we evolved into what we are, instead of merely dissolving back into the primordial slime. Well, there's always that chance . . . Pinning our hopes on that random probability is a tough bet to make, at the very least. There is a design to this universe. That's who we've been talking about anyway.