The fact that the universe shows such complexity and fine tuned conditions for life, that it argues for an intelligent designer. Once such example is the atomic weak force - if it is altered in as much as 1 part in 10 to the 100th power life wouldn't be sustainable.
This type of precision should not be thought of as coming into being randomly. Another objection may be that our universe is one of a multitude of universes and our just happens to be tuned in a way that supports life. However, we should be able to observe other universes, since these types of universes would be much more likely and therefore much more numerous than our own.