The first argument that would contradict the fact that Brave New World is a Utopia is the government overpowering the world, causing the loss of freedom and liberty in the people. Obviously no it's not. In the novel, the people don't have to worry about having a job. One must remember that being born and raised in Utopia, one does not know what freedom is and therefore does not know what is missing. Freedom leads to happiness, and if one already possesses happiness, then there is no need for freedom, especially if your government is making sure that all your needs are satisfied.
Religion plays an important role in people's lives.
It represents our principles and values. Religion guides us, gives us something to believe in and a set of rules to live by. Mustapha Mond is saying that with the evolution of time the need for religion has disappeared and has been replaced by the worship of another God who is Ford. They basically live a fulfilled life and then they die. Also thanks to their conditioning they do not fear death but accept it as a way of life.