C I think. Not Sentence fragment I think and definitely not complete sentence. :P
Answer:
Ther is no story (?) Are you asking for the term?
It necessary that all individual conforms to a certain belief system in a utopian society because it is the starting point for the utopia, to believe in something greater than them and to trust in it to get to a new better world. If the people who belong to the Utopian society, start to believe in a different belief system individual, The utopia created at the beginning could disappear.
I believe it is simple and merry christmas to you too