Lets say you are Mormon (Catholic, Jewish, Baptist) and in Saudi Aribia it is against the law to preach your religon to citizens of that country.
The Saudis (Muslems) could go to your ISP and ban your communication with an of their citizens. However, under U.S. law, our country can not make any law that affects religion.
Internet makes the "rules" fairly nebulous, don't you agree?