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.
"It" is the<span> stated antecedent. It assumes you know what it is talking about</span>
