Not that this will matter because the poster believes in God and there is no way to logically argue with a religious person;

But It's all to do with the nature of Infinity, because the universe is so old it is more likely than not that life would have developed over that time, Basically to analogize; "A much less likely scenario would be an untrained monkey, or lets say something that randomly generates letters/words would be able to form the complete work of Shakespeare, However given Infinite time this Would Happen" So basically if given a large amount of time, intricate culminations can form from seemingly "Random" or even completely random processes, this is to say that it is absolutely possible, in fact more possible than not possible (In terms of Entropy) that due to the age of the universe that the "Seemingly Random" Processes of atoms would form complex molecules and these molecules would form structures like Protozoa, Bacteria, etc. Which again over time would evolve into (Through random or seemingly random processes) multi cellular organisms like plants, animals.