At the risk of lighting a fire under some fundamentalists, I will attempt to shed a bit of light here.

The Bible is regarded as spiritual truth. It depicts and explains (to various degrees of success) God's relationship to Man, and teaches Man how to relate to God. It also teaches how to relate to the world and other humans. For those of faith who accept it as spiritual truth, there is really no argument to be made to the contraty.

The Bible is not historical or scientific truth as we understand such things. It is not meant to be an absolutely accurate historical narrative, filled with incontrovertible facts. Those who try to see it as such are, I'm sorry to say, failing to understand what the Bible really means.

In your specific example, the Bible is not intending to, nor should it be expected to, give us a complete accounting of the development of the human species. We can use our God-given brains to learn that (this is what scientists do). The Bible is telling us that mankind in toto (physical, mental, spiritual) is a creation of God, and that we have had an evolving relationship with God through the ages. It is not telling us, nor attempting to tell us, exactly how this creation was accomplished. Look to science for our best understanding of how humans physically came to be; look to the Bible for the meaning behind it all.