Answer:
The Supreme Court means that a person has the freedom to believe whatever they wish, that cannot be changed, and they can't be prosecuted for that. The freedom to act for their religion is not absolute however, as a person might commit a crime and say they were acting on behalf of their religion. If the second sentence was to be absolute, many crimes would be committed everywhere, and many people would go uncharged for their crimes.
Explanation:
A person shooting another person, and saying they did so for their religion.
A person stealing a large sum of money, burning it, then saying they acted under their religion.