What is interesting about "Utopia":
In 1516, English humanist Sir Thomas More published a book titled Utopia. It compared social and economic conditions in Europe with those of an ideal society on an imaginary island located off the coast of the Americas. More wanted to imply that the perfect conditions on his fictional island could never really exist, so he called it Utopia, a name he created by combining the Greek words ou (meaning "no, not") and topos (meaning "place," a root used in our word topography). The earliest generic use of utopia was for an imaginary and indefinitely remote place. The current use of utopia, referring to an ideal place or society, was inspired by More's description of Utopia's perfection. (https://www.merriam-webster.com/dictionary/utopia)
Utopia then is either an ideal place of perfection or an ideal place that can never possibly exist.
I appreciate your view that the resurrection of Jesus Christ changes everything. St. Paul correctly stated that if there is no resurrection and if we have only hoped in Christ in this life, we are of all men most pitiable, the most miserable (I Cor. 15:19). BUT...now Christ IS risen! The world without Jesus Christ offers nothing but temporary pleasure. Our souls are meant for eternity.
“What else does this craving, and this helplessness, proclaim but that there was once in man a true happiness, of which all that now remains is the empty print and trace? This he tries in vain to fill with everything around him, seeking in things that are not there the help he cannot find in those that are, though none can help, since this infinite abyss can be filled only with an infinite and immutable object; in other words by God himself” [This is from page 75 of Blaise Pascal’s Pensees (New York; Penguin Books, 1966).]
Utopia then is either an ideal place of perfection or an ideal place that can never possibly exist. Absolutely true, and also why I'm not a humanist. Even if I were an atheist, I would reject utopianist nonsense.