Augustus
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However, Marxism represents a philosophical tradition so alien to liberal scepticism that a theist has no right to draw a comparision between the two. They are two different atheist ideologies, which whilst having common origins in the Enlightenment, do not have common results.
The Enlightenment(s) certainly gave birth to both liberal and decidedly illiberal philosophies. While it emphasised science and reason, these are not intrinsically liberal in their nature. Liberalism was by no means a necessary requirement to be considered an Enlightenment thinker, and the Enlightenment(s) was/were not fundamentally about liberal political ideologies.
Many people like to pretend that this is not the case as it doesn't suit their ideology and seem to assume that the application of 'science, scepticism and reason' necessarily lead to modern secular humanism. Am sure you have noticed people trying to deny that authoritarian ideologies like communism could be in any way considered products of the Enlightenment.
No, Marxism and atheism are not related.
As atheism is a significant component of Marxism, am not sure how you reach that conclusion. Of course they are related, they are not synonymous, and an atheist is not intrinsically connected to Marxism, but to deny there is any relationship between them seems bizarre.
American Conservatism is not necessarily Christian, but you can't deny there exists a relationship.