Believing in name only is existentially irrelevant. Jean-Paul Sartre offers another example of how action is the only true affirmation of faith. In his philosophical writing, Sartre holds that to be a self-professed atheist, Christian, or hero means nothing if it is not followed by the action of that faith. Professing to be something, which is not reflected in action, is, according to Sartre, bad faith. To say that one is a Christian, and then not to abide by Christian doctrine is a demonstration of bad faith.
Active faith requires the action match the claim.
In Sartre's play, No Exit , the character of Garcin demonstrates Sartre's claim that what you say you are means nothing unless your actions are congruent with your claims. Garcin continues to claim heroism even though he fled at the first sign of real danger. Well, I didn't give a damn for wealth, or for love. I aimed at being a real man. A tough, as they say.