It’s a holy war. East Coast nuns are pushing the power of prayer onto the Knicks as the NBA Finals rage on — setting up a biblical showdown with an uber-famous group of Spurs-supporting sisters. The NBA championships have split the Salesian Sisters of St. John Bosco by geography, with the East Coast and West Coast groups documenting their superfandom on social media. “We put on the T-shirts, we posted a little video. We’re here for cheering for the Knicks,” said Sister Katie Flanagan, director