I literally cannot avoid sinning; so, why...

[Lek]

I haven't figured that out yet. While we're at it, I also have a question for you. Why would a universe that just happens to be here be so hostile to it's inhabitants?

It's not. Millions of species evolved and thrived for many millions of years.
Evolution doesn't care about individuals. It promotes survival of species.
We are indoctrinated with the notion of "individualism".
It hasn't always been that way. Individualism came from Greece in about 500-300 BC to the Levant.
It's actually why during that period, the Jewish prophets began to insist on monotheism, an individual deity.
Before that, Israel was polytheistic.
Before that, "immortality" consisted in the continuity of the male line.
That changed with individualism.

Most of those species that survived got wiped out.