you may like to read about the "rare earth" hypothesis and the "fine tuned universe" theory.
Do you have some books or articles you could suggest?
Call me gen Z but I prefer my knowledge in video form. Can highly recommend PBS Spacetime's coverage of the topics: https://www.youtube.com/channel/UC7_gcs09iThXybpVgjHZ_7g
We know it is anywhere from 0 (originated elsewhere and found its way here) to 1 (originated here and is guaranteed to originate given the conditions). I don't think we have enough data points to determine improbability yet.
What is the probability of life originating in the universe? We know it is definitely greater than 0..