Once you remove one belief then its simply replaced by another and there can't be better example than Communism. Communism was nothing if not a superstition.
That's an oversimplification. We're not talking about belief so much as faith, which isn't exactly the same thing. It's more useful to the discussion to rephrase that statement as: Once you remove faith in something it's simply replaced by faith in somthing else.
Religion is faith in the supernatural, faith in something that cannot be proven or disproven. Religious faith is based on archetypes, instincts we almost all have which make us feel like we "know" something for which there is in fact no empirical evidence.
But it is possible to have faith that is based on empirical evidence, on reason and learning.
When you first fall in love with someone, you have faith that they will live up to your expectations. That faith is based on the emotion of love. After you've been married to them for ten years and (ideally) observed empirically that in most situations they have behaved as you expected them to, and furthermore this correlates with other observed behaviors that appear to illustrate the same character traits, your faith is now based on reason and learning:
learning how they behave and
reasoning that the probability is very high that they will continue to do so. If they do not do this, you may still love them and decide to stay with them, but you abandon your faith in them.
The Russian underclass had faith in communism, but that faith did not have the same purely emotional basis as faith in supernatural beings. It was not
superstition as you call it. Communism was an economic model based on logic rather than feudalism. It included a political model based on dictatorship by people who appeared to be benevolent common folk, rather than despotism by people who had already proven themselves to be uncaring aristocrats. Faith in communism was based on logical reasoning and the "comradeship" (they stressed that word) of people like themselves.
It was a dual faith: that an economy without capital would prevent greed and exploitation, and that comrades would stick together and work for the common good. These were
reasonable premises, at the time. Even today, many people believe that capital seduces people into selfish behavior, although it is recognized that capital is another word for the surplus that drives an economy into prosperity. And even today, many Americans believe that a nation of "comrades" of similar background and culture will generate more common good than one which allows foreigners entry to do the menial work.
It must not be forgotten that for about fifteen years Russian communism delivered on its promise. One of my aunts and her husband emigrated to the USSR in the early years of the Great Depression. It was converting itself into a modern industrial nation, the standard of living was undeniably better than under the Czar, and despite the nascent despotism people felt more secure in their homes.
Communism is a falsifiable theory--the kind that satisfies us scientists--and it has subsequently been falsified. There are many fatal flaws in it that simply could not be identified without implementing it experimentally--again something that should delight us scientists. Now that it has been proven false, people are abandoning their faith in it rather speedily--once again we couldn't ask for more.
Do not expect to see this happen with any major religion. Faith in religion and faith in communism are not the same kind of faith.