One could go on and on. There are many different proposals for how to reach utopia. Although not everyone looks at these fixes as a form of salvation, many times we do look at them as a way of saving the planet or saving the human race or the universe. But although all of these systems or plans or proposals have been tried, all of them have failed to produce the desired paradise on earth which we have come to expect or at least hope for.
These plans for saving the planet or human race or whatever are doomed to failure because as human beings we simply lack the ability to achieve our own salvation. Only God can save us. Furthermore, we already have a Savior- Jesus Christ, so we do not need to go looking for another.
I am not denouncing any plans to care for the earth, or to develop a more just society. With God’s help, we should strive for these and many other goods. It is just that without God, and without reference to God, these utopian visions are useless. We will never achieve complete peace and contentment in this life because we have to die and rise again on the Last Day to gain it.