Why does life evolve? Doesn't it evolve to adapt to the environment that hosts it? After all, if life failed to adapt to its environment, it would cease to exist. Darwin and his fellow scientists have observed that all of the organisms on this planet are engaged in a process aimed at the perpetuation of life here. In other words, life is preoccupied with the perpetuation of itself. Why? What is the impetus behind the adaptation of species to their environment and the survival of the fittest?
Many Theists have focused on the circumstances that have made life possible on this planet and have pointed at how they favor the existence of life here. I think that it is much more interesting and remarkable to consider how that life has evolved to fit the circumstances in which it finds itself.
At first glance, natural selection appears to be a completely random device - until we consider the fact that its objective is always the perpetuation of the organism. We have tended to ignore the significance of the fact that the environment "chooses" those characteristics within an organism that best suit its survival (e.g. fat, hairy, white bears have a better chance of surviving in artic climates than small, balding, black bears do). Take just a moment to consider all of the physical adaptations that have been necessary over vast expanses of time to arrive at where we're at today (e.g. the differentiation and specialization of organs within both plants and animals to perform certain functions to facilitate the survival of the organism as a whole). Think too about how behavioral instincts have developed within certain animal species that have made significant contributions to their survival (e.g. nest building, feeding and reproductive rituals). Consider how humans have used artificial selection to produce desirable traits in plants and animals to help perpetuate humankind (e.g. docility, productive capacity, disease and pest resistance, beauty, etc.). Nature, however, has always "selected" those traits which are best suited for the survival of the succeeding generations of a species (or life in general).
The inability of an organism to adapt produces extinction. Nevertheless, through all of the catastrophic events that have occurred on this planet (volcanic eruptions, asteroid and meteor impacts, atmospheric and climactic changes, etc.), life has continued to exist and adapt to its new circumstances. Thus, when we look at this from a macro perspective, it appears that individual species are much less important in the grander scheme of things than the perpetuation of life in general. In other words, whatever species (or group of species) best accomplishes that goal/objective/purpose (however you choose to describe it), those are the one(s) that survive and thrive.
Hence, for me, evolution suggests God. For me, the available evidence points to the existence of someone or something that provided a mechanism for life to perpetuate itself here (and very likely in other places too)! It should also be noted that evolution explains the continued existence of life on this planet - it does not truly explain the origin of life here. Moreover, whether one chooses to explain the origin of life as someone (God) or something (a "random" mix of molecules in a primordial soup), it seems to me that both the origin of that life and the mechanism for its perpetuation (evolution) demand an intelligent source. And who needs gaps? For me, the more evidence that Science discovers about the origins and perpetuation of life on this planet, the more evidence we have for the existence of a Creator. What do you think?