We aren't the manufacturer of the process that lead to human and other living things,
I don't see that we need to see it but we have to realize it.
The point is, though, there doesn't need to be a maker regardless if you can see it or not.
Humans try to find origins to everything to give themselves grounding. It helps to know where you're from so you know where you are and where yo are going.
That is not the way the world works. Everything has always existed in one way or another. A car has always been a car we just didn't define it as a car until someone
formed already existing parts and material together to shape what we now define as a car.
Things aren't created from no where. Space isn't created. The universe isn't created. Since everything is not created from thin air, there is no creator.
What we considered "created" is just already existed things put together to make something else we haven't seen or experienced before. We label it, define it, and wallah! A Car.