I'm not entirely sure. I lean to the side that God guides -- I have a hard time seeing natural selection (plus genetic drift and all that) as the explanation for life as we see it today. But I might be wrong. I'm always collecting more information.
I think it's important that people of faith have approach this topic with discernment. It's very easy--and very common--today to make a hard distinction between natural activity and divine activity, or what we might call the natural and supernatural. And so to bring in, as a matter of faith, the concept of God in certain areas such as this we might be tempted to think there must be an either-or decision to be made. Either evolution is through completely natural mechanisms such as natural selection or else "God did it". I think that this is, fundamentally, a false dichotomy.
I usually like to turn to the topic of procreation, from sex, conception, gestation, to birth is the process of natal human development a natural process that can be fully comprehended naturalistically, or is God involved? That is, can I say that God created me in my mother's womb? I think when we look at this topic we can see why, from a faith-based perspective this is a false dichotomy. Yes, the entire process of procreation can be easily understood through entirely naturalistic means, but this does not exclude the activity of God within the natural processes. The completely natural mechanisms and means which can be understood through science are, in faith, understood as means by which God makes you and I as individuals within the womb.
It's therefore really only a matter taking this principle and looking at other naturalistic processes the same way. When it comes to evolution it's not a dichotomy between natural mechanisms or divine activity, it's confessing in faith that God as Author of the cosmos has put into place completely naturalistic mechanisms and processes which are completely satisfactory explanations for how things happen.
Such that when we understand that science approaching the study of the natural world has competent natural explanations for natural phenomenon--and if science is being done correctly provides us with invaluable and exceptional knowledge of how the natural world operates. The role of God is not mentioned because science simply doesn't have anything to say on the matter of God, God isn't a natural phenomenon and therefore doesn't fall within the scope of science. The role of God's activity is not a matter of science, observation, or empirical exploration of phenomenon--the role of God's activity is a matter of faith and revelation. As Christians we confess the activity of God not because God can be comprehended naturally, but because we have faith in the revelation of God in the history of the people of God, receiving in faith what has been passed down to us from those who came before. It is therefore a matter of faith to speak of the activity of God, not a matter of observation or knowledge--at least not knowledge in the empirical, scientific sense. We don't know God because He can be seen through the telescope or the microscope, we know God in faith through the revelation we have received, namely the revelation of God's Self through the person of Jesus Christ.
Which is all to say, natural selection does quite adequately address and explain how evolution works and has worked for roughly 4 billion years on this planet; but this doesn't exclude God's role in all these things. We, I believe, err in thinking of God only as a cosmic puppeteer pulling the strings from behind the curtain of the universe, God is both the transcendent and the immanent, beyond all things and also through all things, from the grand unifying mechanisms that hold the universe together to the tiniest subatomic particles interacting with one another at the quantum level. God is beyond, above, and through all things (Ephesians 4:6, Acts 17:28)
-CryptoLutheran