This may be a strange thing to say about a story of passion between a priest and a nun, but Stanley Kramer's "The Runner Stumbles" is almost endearingly old-fashioned. It's been a longtime since I've seen a man and a woman at arm's length, struggling against the flames of temptation that threaten to consume them, while tempestuous music whirls on the sound track. These days, a love scene is much more likely to involve Woody Allen discussing Mariel Hemingway's homework. But "The Runner Stumbles" involves big questions of ethics and morality, and so, of co...