Certainly 100.000 aminoacids in a particular sequence sounds quite unlikely, not impossible mind you, i don't know where this number cames from.
The minimum unit that would have been needed would be a self replicating protein, that would be way less than 100.000, of course i wouldn't count it as Life, but it's a start. This could have happened in warm pools, with abundant water and organic compounds, and a lot of time, it doesn't mean it happened the first week, but once it happened, and you have a single self replicating structure in the entire planet, if the environment stays that way, it's bound to spread.
When you say things like "Impossible" it seems like u can guarantee that it cannot happen, and for all we know, all this phenomena are: if unlikely, certainly allowed by the laws of the universe, nothing miraculous happened, just highly improbable.
I really have a hard time believing that a book compilation as the Bible offers better explanations for things that are so far in time, i think it was written by humans, fallible, biased, with personal motivations humans, and the way they explained the genesis of the world it was quite convincing for that time, but our actual ways of measuring and discovering stuff are way beyond ancient imagination, maybe they are less fantastic, less satisfactory, less human centered, but nonetheless, seem way more plausible that a "being beyond nature made it all"
Cheers!