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.
The water was not literally freezing. A hyperbole is a figure of speech that exaggerates something, in this case the use of a hyperbole exaggerates how cold the water is.
