Almost any group could satisfy that definition of “religion”, as long as “superhuman agency” could be the universe itself, fate, the laws of nature, etc.
Whether Islam is or isn’t a religion, it is also much more than a religion. It is also a cult (at all times) and an enemy of the US Constitution (by extremists or by all adherents when they become 10% of the population).
While our laws and Constitution allow freedom of religion, they do not allow the crimes used by cults and/or treason.
At http://www.freerepublic.com/focus/news/3198476/posts?page=32#32 I suggested that Islam be considered a religion until its adherents approach 8% of the population, at which time it would be considered an enemy of the US Constitution because of its own requirements that its adherents become enemies of the US Constitution when they reach 10% of the population. Therefore, the policy should be that the nation will monitor the number of Muslims in the country to make sure that they never reach 8% or higher - thus allowing them to remain a religion not bound to commit treason against the US and our Constitution.
I agree.
It is also a cult (at all times)
The most accurate definition of "a cult" being an unpopular religion.
The term actually had technical definitions till a few decades ago when it began to be used by "traditional religious leaders" to stigmatize new and "weird" religions.
By that definition, of course, the early Christians were "a cult." In Oz, till recently, Seventh Day Adventists were considered a cult, probably one that ritualistically killed children.
Of all the things I can think of as a bad idea, putting some government agency of deciding what religious beliefs are acceptable, and which are "a cult" or "not a religion" is very near the head of the list.
Look at it this way. There are a good many people who believe any disagreement with the gay agenda is "hate," and that any religion that teaches hate isn't "a real religion." Do you want a government agency to have the power to make that determination and use government authority to crush "hate religions?"