If your ethics are guided by the Bible, there's certainly nothing wrong with that. I think, though, that you're discounting the fact that all religions have ethical/moral guidelines regardless of whether they are Christian. Also, even if you're talking about a religious basis for morality, the Ten Commandments preceded the New Testament, and by definition, Christianity, by more than a few thousand years.
Morality can be guided by both the philosophical/secular as well as by the religious. Our own Constitution has its roots in great secular minds like De Toqueville, Locke, Paine and Jefferson and no where in our Constitution is the Creator mentioned.