That is completely backwards. I don't care how my car was assembled, I only want to know that it does what its supposed to do, run. "Here we have a perfectly fine automobile, sir, the only thing it doesn't do is go." Why? "Well, we don't know that! That's not important! Look how well it's put together though!"
Humans designed automobiles for a reason: to transport things.
And they figured out how to put things together to get that goal. But all those components were tested independently *first* and then assembled.
You have to understand 'how' before it can be made. We knew the 'why' because we were the ones that decided what needed to be done.
Now, in the case of life, we *know* it works: it grows and reproduces. the first question is then *how* does it manage to do that. Over the course of the last century, we have learned in detail how life does what it does chemically. And it *is* a complex collection of chemical processes.
To ask where it came from is to ask how that complicated collection of chemical processes started to function. That involves understanding the chemistry not just of the present processes of life, but also the chemistry that can *lead* to those processes. This is the stage we are exploring currently: we are trying to understand the chemistry that can lead to the complicated processes involved in life.
This is the study of where life 'came from': by what mechanism did it arise. What conditions were required for it to begin? how did the variety of different chemical processes that we know *is life* begin and become integrated together?
So, once again, we *know* life is a complex collection of chemical processes. We *know* hat the original chemistry is not the same as the chemistry involved now. We are *investigating* the chemistry involved that *could* be a precursor to processes involved in life.
And we do not have all of the answer yet. But we know where to look and what sort of questions to ask.