Answer: a first amendment right.
Step-by-step explanation:
The First Amendment (1791) states that religious practices can not be restricted by Congress. However, freedom of expression forbids the restriction of both the press and particular individuals to speak their minds, and it ensures the right to assemble, as long as it´s peaceably. Therefore, as long as the religious practice is not restrained, protesting outside a church or mosque is a first amendment right.