In some cases, as in the second Amendment.
Anything that is not explicitly protected by the constitution is at the discretion of the States...or so it was until about 100 years ago.
I'd phrase it differently. The constitution constrains the federal government to specific enumerated powers. Anything else it leaves to the states and the people.
One of the things left to the states: the power to establish state sponsored religions.
Dear Secretagent,
Phrase it anyway you want as long as it is true. Just pick up the torch and carry it. I may not say it right but I try to make as much sense as I can with an aging mind. At least I got your attention. Keep the flame of freedom alive.