Many who do not believe in the Bible embrace the theory that living things emerged from lifeless chemicals through unknown and mindless processes.
Supposedly, at some point a bacteria-like, self-replicating organism arose, gradually branching out into all the species that exist today. This would imply that ultimately the mind-bogglingly complex human actually evolved from bacteria.
The theory of evolution is also embraced by many who claim to accept the Bible as the word of God. They believe that God produced the first burst of life on earth but then simply monitored, and perhaps steered, the process of evolution. That, however, is not what the Bible says.
The Bible account of creation does not conflict with the scientific observation that variations occur within a kind.