You said, "But the courts have also ruled that you can't force anyone to do things that are against their religion (religious drug use, conscientious objectors, etc.)."
The Religious Freedom Restoration Act specifies the conditions under which people
can be forced to do things that are against their religion, as you acknowledge below. So the law you cited proves you wrong.
The Religious Freedom Restoration Act is a congressional law, and it doesn't nullify the Smith decision or the Constitution. It
does impose further restrictions in addition to the constitutional restriction that laws must be neutral and generally applicable.