How come humans don't know what created us?

The part of the brain that gives us the sensation of being aware of ourselves seems to have evolved along with other human traits. Thus, to have the idea that we came from somewhere, from distant relatives, seems to be unique to humans. Writing is very, very new in human history. For 99% of the time humans have been around, there was no writing.

They had no writing, and were just following the herds of animals, trying to survive in often difficult conditions, with only primitive stone, bone & wood tools & weapons. They knew no science or mathematics, had no maps, and relied on memory to know where they were, but such knowledge could not be transmitted through the generations without loss; their grandfathers may have known what the land beyond the mountains was like, but not anyone still alive in the tribe.

There are human-like artifacts found. Things that occurred a long time ago have very few records. Oldest human DNA found was from about 400,000 years ago: http://news.nationalgeographic.com/news/2013/12/131204-human-fossil-dna-spain-denisovan-cave/ There were stone tools found from 2.6 million years ago. http://humanorigins.si.edu/evidence/behavior/tools There is very little evidence from a time so long ago, and certainly no written record survives.

We know. You apparently skipped biology class.

We were not created, we evolved. As evolution works across many, many generations no one human is going to see significant amounts of change during their own lifetime. And yes we do know what we evolved from and how we evolved.

they knew