When we lack recourse to a Creator, rights become mere assertions of power. Those who have power do what they want to do-- and call it a "right". Without transcendence there are no rights, because without transcendence there can be no objective moral truths-- no rights-- at all.
Atheism cannot withstand reasoned examination. The assertion that everything came from nothing, without reason and without moral law, isn't defensible in rational discourse, so forced silent assent is necessary for atheism to hold sway over culture. Censorship is in the marrow of the godless. There are to be no questions that might lead to a Source for existence or to objective moral truth.
Atheists can't really use reason, in any coherent way. Reasoning itself depends on objective truth, a concept denied by atheist dogma. Reasoned discourse is anathema to atheists, because a world without purpose is a world without reason.
Censorship is the core manifestation of atheism-- all of atheism's power depends on making atheism immune to questions.