This article contains this:

In Gramsci’s own words, he viewed the task thus: “Socialism is precisely the religion that must overwhelm Christianity. … In the new order, Socialism will triumph by first capturing the culture via infiltration of schools, universities, churches, and the media by transforming the consciousness of society.”

That however is somewhat of a misrepresentation of what Gramsci said, according to this article. A quote from this:

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The fake Gramsci quote (on “capturing the culture”) is often combined with a real Gramsci quote (on Christian socialism). I’ve bolded the real portion:

Any country grounded in Judaeo-Christian values can’t be overthrown until those roots are cut. [….] Socialism is precisely the religion that must overwhelm Christianity. [….] In the new order, socialism will triumph by first capturing the culture via infiltration of schools, universities, churches and the media by transforming the consciousness of society.

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