I say of this imperative that it belongs to “us,” and I do mean all of us, though I suppose if you are a certain kind of atheist — a libertine or a hedonist, for example — you might not be able to reconcile such a position to your own. And while I wouldn’t say that such a person is not of my concern (for we are ‘our brother’s keeper’ in every regard, including in what they believe) there is only so much one can do before one’s attempts at reaching someone become alienating, rather than welcoming or inviting.