Gary Gutting defends it:
Knowledge, if it exists, adds a major dimension to religious commitment. But love and understanding, even without knowledge, are tremendous gifts; and religious knowledge claims are hard to support. We should, then, make room for those who embrace a religion as a source of love and understanding but remain agnostic about the religion’s knowledge claims. We should, for example, countenance those who are Christians while doubting the literal truth of, say, the Trinity and the Resurrection. I wager, in fact, that many professed Christians are not at all sure about the truth of these doctrines —and other believers have similar doubts. They are, quite properly, religious agnostics.