It can be argued that Marxism is radical Christianity without Jesus. It was embraced by agnostics, marginalized people, anti clerics and others who had come to shun or have an antipathy to religion. The devotion of these people was as fervent and passionate as the most dedicated Christian. Of course communism was a rotten enterprise to its very core. The suffering and deaths of millions is well known. But it is interesting that its fervent followers did need a “god” like figure at its head. Stalin, Lenin , Mao and other communist leaders were deified and literally worshiped by their followers.
Of course they're none of those things and they always fail.
Two things are needed for success in society: God and freedom. Simple as that. God + freedom = astounding prosperity.