"Militant", I assume in this context, means aggressively argumentative and assertive about the falsity of theism. How can that possibly be construed as religious? This is a bewildering mishmash of semantic tapdancing.

Spiritual matters are not really suited for argument; surely the last thousand years or two have demonstrated that. They don't yield to "rightness versus wrongness", since they are not empirical phenomena, and their perceptions are not subject to objectification or physical proof, are only haphazardly repeatable, and are usually not subjected to enough analysis to identify underlying laws and principles.