Does God-Talk Weaken Conservatism?

Heather MacDonald laments conservatism's reliance on religious rhetoric (HT: Volokh):

The presumption of religious belief -- not to mention the contradictory thinking that so often accompanies it -- does damage to conservatism by resting its claims on revealed truth.  But on such truth there can be no agreement without faith.  And a lot of us do not have such faith -- nor do we need it to be conservative.

Rob