Yes, as long as they break no laws. However, there are many laws on the books that prevent people from protesting whenever and where ever they want. For instance, the protest must be peaceful and they can not incite imminent lawlessness. They often must also obtain permits if the assembly is to be conducted on public property.
They are a group of lawyers, they seem to always stay just within the law.... that is the problem with taking any action against them
What they seem to be doing is trying to legally push peoples buttons until they act emotionally and give them reason to sue imo
Because they are a Religious group, they then can invest everything tax free and go on living their lives well off....