The total probability is calculated by multiplying the individual probabilities that make up the total. When we start considering highly complex things like life, atomic structure, chemical processes, or galactic events, the individual odds are not nice and simple like one out of two. Not only are the numbers not as simple, but there are far more variables involved. When scientists do these kinds of calculations they end up with probabilities that are so astronomical that chance becomes a clearly untenable explanation. On top of that, the event is only one step in a long line of steps to get to a desired final objective.
Chance is an invalid mechanism to explain the complexities seen in all parts of the cosmos.
If there is an intelligence who used purpose and design to accomplish the creation then the odds no longer are relevant. A tornado will not go through an aircraft assembly factory and produce a 747, but human intelligence and creativity will. Not only do the three forms of design in the cosmos demonstrate to us that we are the product of design, purpose, and intelligence, but the same design defines the properties of God. Power, intelligence, creativity, consistency, adaptability, and an incredible love and concern for man are all displayed. The lessons we can learn by studying God's design and planning are many and can draw us to our creator and His design for our own lives .