That indeed is a viable possibility, isn't it. I have no problem with atheists or agnostics or hindus or Bhuddists who deny that God created the heavens and the earth. If in fact God did not create the heavens and the earth, then my faith is in vain.
I have a lot of problems with people who claim to believe in the God of the Bible, yet doubt the veracity of the very Bible that describes the God they claim to believe in.
If in fact the words on the Ten Commandments were just made up by men, then both Jesus and Moses were either frauds or fantasies. But if the story in Exodus is true, then God did indeed make the heavens and the earth and all that in them is in 6 days. Now we can argue as to what the meaning of "day" is, but it is clear that the description of creation in Genesis and it's confirmation in Exodus 20 contradicts any notion that the macro species we see on earth all evolved from some primitive (as yet to be identified) one celled randomly generated life form. It also contradicts any notion that man evolved from some lower life form, as man is specifically mentioned as a special creation of God.
I just don't countenance those who claim to believe the Bible, but can't seem to get past the first verse. If you can't get past the first verse of God's revealed word, then for God's sake, put it down and quit pretending to be a believer.
Considering nearly identical* "rules for living" were around before the 10 Commandments, and that many different societies around the world came up with these rules independently, why would you even think that a fictionalized account of how the Hebrews arrived at the same rules means that Jesus or Moses were frauds or fantasies?
*Aside from the first couple of commandments, the rest are simply common sense measures to allow people to live together peacefully.