Christian socialist is definitely not an oxymoron. From https://en.wikipedia.org/wiki/List_of_Christian_democratic_p... : "Christian democracy often advocates centre-right positions on cultural, social, and moral issues and Social market economic policies" and further, "whereas in the very different cultural and political environment of Latin America they tend to lean to the left".

Utopian socialism is an actual thing : https://en.wikipedia.org/wiki/Utopian_socialism , related to socialist utopia, in a way that is characterised as "possible ways society can turn out to be in the future".