They are, but they don't have to be.
Marxism/socialism says that co-operation is a good thing, so we'll give the government the authority to require everyone's co-operation and collective responsibility.
Christianity, along with Aristotle's societal organization, says that co-operation (loving your neighbor in Christianity) is a good thing, so we should promote individual virtuous behavior leading to it.
It's basically the difference between having the government collect your work-gained wealth in order to spend it on building barns for the collective farm, and teaching people it is a good thing to help your neighbor build his barn on his property, and for your neighbor to help you build yours.
In Christianity and Aristotle, the cooperation is willing. In socialism it is compelled. And socialism always comes with concentration camps.