Genesis does not necessarily indicate that the earth is only a few thousand years old. Gen 1:1 states that in the beginning, God created the heavens and the earth. This could indeed hve been innumerable years ago. Gen 1:2 implies that something catastrophic had taken place, for the earth had become waste and void. Gen 1:3 starts yet another epoch, where God moves to refashion the earth. The verbs used in Gen 1:3 and following indicate working with previously existing materials (made, formed, set, etc.) as opposed to the verb "created" in Gen 1:1 which literally means to create ex nihilo - out of nothing.
Thank you for confirming the ambiguity I was addressing in my post. I was not the one to submit the false choice that either the Bible happened according to my personal interpretation or else God is a liar.