I can’t or won’t understand it, but how could a one in a billion happening, happen more than once...and in such a manner as to have the two things be compatible?.....just a question that rolls around in my head. Like how could two neanderthals, or two cro-magnons, or two homo-sapiens exist at the same time? Only if the first life forms evolved simultaneously and mutated simultaneously....I don’t know, it takes more effort to believe in random selection, life starting from a chemical soup, than from a guiding force.
Mutations are more common than you think.
It is minute mutations that lead to better abilities, being favoured over time, that brings about the overall change, in a span of millions of years.
It’s not a “one-in-a-billion” happening as you imagine, but something far more frequent. That is how bacteria are able to overcome antibiotics that used to wipe all of them out, before. For more complex organisms, the mutations accumulate based on how they are favoured, during mating.
“Guiding force” is fine, but when it is explicitly detailed in terms of flashes, magic and smoke, it gets too absurd to even consider as possible reality.