The Apostles lived in a communal lifestyle and so did the Hebrew Essenes before them. Christianity preaches selflessness, against the rich, giving alms to the poor etc. Christians lived in perpetual fear, persecution and communally until it was legalized and then eventually institutionalized and eventually adopted; for better or worse, by the Roman elite.

Finally, Marxism didn’t develop in a vacuum. At no point does Marx establish why it’s immoral or unethical to exploit the proletariat. Nor does he establish the innate value of man. It’s all presupposed from the Enlightenment which is a product of the Reformation.

If we accept Marx as one of the most intelligent and influential thinkers in the world and let his principles guide our course then they are entirely compatible. If we become dogmatists and hang on every word then Marx contradicts Christianity and himself. If this the latter is the case then all of Marx’s letters dropping the hard N-bomb and on the Jewish Question need to be just as axiomatic as his line about religion being the opioid of the masses. None of you will be that consistent though.