Peter Singer on Religious Freedom

A few days ago, at First Things, Joe Knippenberg linked to a piece by Peter Singer, "The Use and Abuse of Religious Freedom."  Singer's view, it appears, is that religious freedom is not violated when religious exercise is burdened, disincentivized, discouraged, or discriminated against, but only when something that is religiously mandated is prohibited by the government.  A crabbed view, to say the least.