First Things is published by The Institute on Religion and Public Life, an interreligious, nonpartisan research and education institute whose purpose is to advance a religiously informed public philosophy for the ordering of society. As far as I can tell, all of their print articles are available in full online. And, these articles are almost always of high quality. If you're curious about how religious people actually think about the appropriate place of religion in a multicultural society under a secular state, you can do no better than to begin your reading here.