Metanarrative

Metanarrative is one of those fancy words that philosophers love to use, and I love to spell badly. Jean-Francois Lyotard described postmodernism (simplifying) as the condition of suspicion of all metanaratives. In my class on postmodernism and interesting question was raised. Is Christianity a metanarrative?

I suppose my thinking had been yes, but postmodernism had been right to reject the metanarative of the elightenment but had thrown the baby out with the bathwater on metanaratives. But what if it is right? What if all metanarratives are idols? Lyotard object to metanaratives as they are only claims to power. He concludes his thesis that we should wage war on totality, which i take to mean a rejection of all attempts at self legitimisation. Karl Barth said that the moment that christianity tried to prove itself the true relgion it would by this act show itself not to be. Has Barth avoided the postmodern critique of metanarratives by not arguing that Christianity is not a metanarrative? Christianity does not seek to legitimise it self by anything outside of revelation, does it therefore claim universality without claiming totality?