You obviously know nothing at all about Darwin as a human being. He was not a "progressive". He was an English naturalist who had little to no interest at all in politics. He had no care one way or the other of "pushing" or not "pushing" God anywhere. If anything, he was a typical muddled, middle-of-the-road Anglican. He did not have the agenda touted by so many paranoid delusionals. Darwin and Marx did not sit together over tea and conspire to bring about the death of humanity. Marx did not at any time declare that religion should point to government. He simply wished to do away with it because it was his conclusion that religion had become nothing but an arm and enabler of government. It was a way for governments to manipulate and distract people, thus to control them. That was Marx's point. Marx's point was that government officials would use or co-opt religion to "wave the cross around" in order to pretend to great morality, thus authorizing themselves to do everyone else's thinking for them.
Marx's solution was to conclude that, since religion could be abused in such a fashion, it had to be done away with and since it could be so abused, it meant there could be no God, since a real God would protect religion, or at least the correct one. Marx was in error on these two points (among many others), but anyone who c...laims that Marx intended to use religion to worship the state is either lying or been badly lied to. If anything, Marx wanted to eliminate religion and ceremony altogether as being too dangerous for the people--that would include government-worship ceremonies. What was done with his (flawed) analysis is one reason that he eventually stated, "If this is Marxism, I am not a Marxist".
Funny thing--the last time I saw anything that looked A GREAT DEAL like worship of government, it was at a Baptist church, on a Sunday that was near the 4th of July.