Yes, religious liberty is enshrined in our Constitution, but people can certainly mess with it because the U.S. Constitution is a living and amendable document.
The American experiment, which is fundamentally what this country is, relies on participation — not only voting (which it demands) but also participation. Showing up. Rolling up the proverbial sleeves. Having ideas, putting feet to them, and making them work. That also means America evolves. The very nature of participation means that the system is changed by those who participate in it; that’s simply how systems work.