Scientists have calculated that the odds of the natural forces of primordial physics and chemical phenomena combining at just the correct time and conditions to form a single protein molecule successfully as much less then 1 chance in 700,000!!

The same small odds must play out in order to create each new molecule of the same type as well as any variant molecules. A critical mass of a significant variety of simple molecules would be necessary in order to create a single complex molecule such as a protein. Imagine the staggering odds against spontaneous initial evolution just at the chemical level!