Here are some definitions of nationalism that would suggest parallels to religion and are on point (more or less) to my assertions:
An individual's internalization of the set of beliefs and values expressing love, pride and identification with a given nation state. Ritual and symbols are important tools in fostering nationalism among the citizenry.
Loyalty and devotion to a nation or ethnic group that places emphasis on promoting the interests, cultural and social values, or religion of one group above all others.
Pride in one's country or culture, often excessive in nature.
The advocacy of the utmost political advancement of one's nation or people, without regard to the consequences, in promoting hostility and competition, discrimination and vilification. See fundamentalism.
The doctrine that your national culture and interests are superior to any other.
http://www.google.ca/search?hl=en&lr=&oi=defmore&defl=en&q=define:nationalism