These new religions to which Jews are devoted do not always define themselves as religious movements.
The urge toward idolatry can also take the form of secular or even atheist movements and ideologies.
In pseudo-religious movements, such as Communism, as well as in many other spheres of religious devotion—in national movements and even in the aesthetic sphere, above andbeyond any personal matter or interest—we can also find a religious element, the need to attain devotion, identification, and cultic ritual.
Therefore, those Jews who follow such movements do so as an expression of their deep religious nature.
–Rabbi Adin Steinsaltz