The odds of our mathematically precise, finely tuned, life sustaining universe coming into being by accident is so astronomically improbable that it’s been described as randomly throwing a dart at the universe and hitting the correct proton.
Now, if that in fact happened, as is the case for our universe, you have two options to consider:
1) Something outside of nature or something Supernatural caused this to happen. In other words it was rigged to happen, or
2) There are an infinite number of universes that over an infinite amount of time with an infinite number of possible constants and quantities that finally resulted in a life sustaining universe such as ours.
Which would a rational person abiding by Occam’s razor use? Number one
Which would an atheist choose abiding by Occam’s razor? Number two.
As long as it keeps out Creator God, no hypothesis is too complicated, no amount of evidence too absent for atheists.
In reality, our universe is deigned for life because Someone designed it that way.