It was certainly not limited to only the people engaged in militia activities, nor was it limited to only people who would be required to engage in such activities.
I see no reason to believe that it was not the same people who were guaranteed their freedom of assembly, freedom of speech, and freedom of religion in the First Amendment.
Maybe not today. We'll see what the U.S. Supreme Court says. But in 1792 that's what it referred to -- the "original meaning", if you will.
Are you a supporter of "original meaning" or "the constitution as a living document"?
"I see no reason to believe that it was not the same people who were guaranteed their freedom of assembly, freedom of speech, and freedom of religion in the First Amendment."
The same people who were guaranteed their freedom of assembly, yes. The Founding Fathers did not limit the freedom of speech and freedom of religion to "the people".