Yeah people say 'freedom of religion' without realizing those words don't exist in the Bill of Rights. It just says Congress CANNOT make laws concerning the advancement, suppression, or influence of religion.
What people like the Left have done is use the excuse of 'Separation of Church and State' in getting Christianity shut down in the public square. It's another in line that DOES NOT EXIST in the Constitution. They do this by using another Constitutional Clause that states that courts can declare the constitutionality of a law or concern. . .but wait. . .that power for the courts DOES NOT EXIST in the Constitution.
In other words dems/leftists use powers that NEVER EXISTED IN THE CONSTITUTION to get their way.
Interesting that the Chinese don't mind oppressing the heck of any Muslims inside China and the latter is/was known to sell weapons to the former. . .interesting that Iran keep yelling that Israel and US are 'Satan' but never call China that.