The parallels are undeniable, from the manipulation of the adherents to conformity, to the exploitation of mandatory compassion, regardless of context, by calling it an aspect of "love". Religion is a form of government, called theocracy. The only difference is the claimed source of their authority: God via its clergy, or the State via its bureaucrats.
No, "religion" is not a form of government. A "theocracy" is a form of government based on religious beliefs/adherence, but that doesn't mean that "religion" is one on its own.
The three most common definitions of the term "religion" are as follows (from Merriam-Webster Online):
: the belief in a god or in a group of gods
: an organized system of beliefs, ceremonies, and rules used to worship a god or a group of gods
: an interest, a belief, or an activity that is very important to a person or group
The latter seems to be the one you are utilizing, as it doesn't refer to any "God" or "gods" so I will address it specifically. Now, "socialism" is not an interest. One can be interested IN socialism, but socialism itself is a societal/governmental construct based upon certain interests. It is defined as "a way of organizing a society in which major industries are owned and controlled by the government rather than by individual people and companies". Now, this is a very broad term, applicable to many current governments and doesn't go as far as say "communism" or "national socialism" (which basically has nothing to do with socialism as it exists today). To Marx, "socialism" was a stage of society transitional between capitalism and communism and distinguished by unequal distribution of goods and pay according to work done. So, it is incorrect to equate it with communisim, especially examples of such from history, as it is not on the same level.
So, how can you consider such a broad term like socialism without a specific "interest" apart from a distrust of private businesses and a distain for unfair business practices as being a "religion"? The state is in no way "worshiped" in this context. Rather, it is trusted as a source of fairness. And, if you ask the common self-described socialist, they aren't going to profess a love of the State. They will point to the unfairness of our economy, inequality in the workplace, and a general distrust of private industries. Is this distrust of private industry what you would claim to be sufficient for deeming socialism a religion? Because, surely you understand that there aren't any deities associated with the social philosophy.