Before the onset of the age of the NGOs, missionary missions were the most effective way to spread colonial and imperialist ideologies throughout the world. Today that agenda did not change ( see what endless Christian fundamentalist missionaries and Muslim Salafists are doing to the world )- only the new the NGOs have become an additional layer to that old colonial structure. Thus no exception shall be mode for religious organizations if their funding comes from foreign sources. In fact- extremist influences are entering Russia under the guises of race and religion and both agenda have the objectives of creating internal strife and unrest in Russia. Islamic agencies which receive money from Saudi Arabia and other Muslim countries should be listed as foreign agents- likewise any Christian mission which receive foreign money should also be labelled as a foreign agency. You cannot have one without the other.