We should go under the radar?

Does "We should go under the radar—for the rest of our lives" mean "we should go low-key - for the survival?"

Background info:

Although an atheist, Harris avoids using the term, arguing that the label is both unnecessary and a liability.^{http://en.wikipedia.org/wiki/SamHarris(author)#cite_note-AAI2007-26} His position is that "atheism" is not in itself a http://en.wikipedia.org/wiki/Worldview or a philosophy. He believes atheists "should not call ourselves anything. We should go under the radar—for the rest of our lives. And while there, we should be decent, honest people, who destroy bad ideas wherever we find them".^{http://en.wikipedia.org/wiki/SamHarris(author)#cite_note-AAI2007-26}