What is Marx's analysis of religion?

Karl Marx's analysis of religion is that he did not believe in the normal religion, he wanted to make his own theory of religion. He thought that religion must be abolished because it was a threat to human progress. He believed that religion stop the progress of humans because they would focus themselves in God and not the society. Karl Marx said, "Religion is the sigh of the oppressed creature, the sentimen of a heartless world, and soul of soulless conditions. It is the opium of the people". He thought that if people oppressed their insight creature of human nature they wont be able to think in a more thoughtfull way, human would put their beliefs first and not the way they really think about something. Human would do first what they think is right and not what their insight would tell them to do.

Do you agree with Marx's analysis of religion?