The 2004 Arts & Faith Top 100 Spiritually Significant Films is a fascinating list. There's much to debate, such as why Martin Scorsese only has one entry and that for The Last Temptation of Christ (incidentally the most complained about thing on British TV ever). Mean Streets is far more powerfully spiritual imho.
Good to see Abel Ferrara on there twice. Bad Lieutenant and The Addiction are both difficult but superb films in their own ways.
At any rate, the list will keep my local video store in business for a while.