We know that intricate machines are designed by smart people; they don't just happen by luck. The idea that living things, which are far more intricately organized at every level than any machine we have made, could have arisen by some unknown series of chance steps is a fairy tale. It has never been observed, and even in the most controlled of environments it cannot be replicated. To me it's far more reasonable to conclude that life was designed by a super intelligent Creator. Just as a piano implies a piano maker (even if we haven't seen them), life implies an original Life-giver.