I guess you're alluding to the Free Exercise Clause of the 1st Amendment's Religion Establishment Clause that says that the government cannot generally prohibit the exercise of religions, right?
You are distorting the argument (knowingly, probably) when you say people think it "doesn't matter", though. For isn't bigamy and human sacrifice illegal even though some religions would promote that shit?
Are you really old or something? I'm getting a "You kids get off my lawn" vibe from you. (And I'm almost 50!)
Yes I'm talking about the Free Exercise Clause, and the state equivalents in state constitutions.
You should read up on the Free Exercise Clause. It doesn't allow people to do whatever they want. It doesn't prohibit the government from ever taking a right away. In fact, every right we have is conditional, including the right to life, liberty, and the pursuit of happiness (as shocking as that might sound).
I was talking specifically about what happens, or should happen, when various rights collide. There is an analysis that people need to think through, which you apparently haven't done. But I understand your knee-jerk response. It's typical.