Anything based on the human fantasy can be viable, but maybe a better question can be in which form. Christianity, as an imaginary system of beliefs and rules (aka religion) heavily relies on the willing of its supportes to believe in it. So imo its a matter of personal selection in relation with the people around you as you mentioned. Faith can be something really different from the mainstream definition provided by the media around us.
We are all humans, and no belief is greater that another. Its just a matter of perspective and tolerance ;)
RE: Is Christianity viable?