Since nobody can ever know what existed before the Big Bang it is, of course, entirely possible that some form of 'creator' was responsible for it.
However it's an incredibly big step to go from suggesting that someone (or 'some being') created the universe and then asserting that the same person/being must therefore be an eternal moral arbiter for all life within the Universe. For example, a scientist could create life in a test tube and then walk away from it. The fact that he created life wouldn't automatically mean that he retained any interest in it, or that he had any right to determine the way in which it then developed. So the notions of a 'Creator' and of a 'God' are entirely separate, despite the attempts of many Christians to link the two together.