If your soap does not contain wheat, barley, rye, or another grain which contains gluten, then it is gluten free. You should also have made it away from and gluten product that could have contaminated it - including oatmeal. Although oatmeal does not naturally contain gluten, most commercial brands are contaminated.
Also I would be suspect of any oil which was from a grain such as rice bran oil, again because of contamination.
If you want to make a true gluten free soap- I would spend a bit of time researching gluten intolerance.