ROME—A Vatican judge on Saturday indicted 10 people, including a once-powerful cardinal, on charges including embezzlement, abuse of office, extortion, and fraud in connection with the Secretariat of State’s €350 million investment in a London real estate venture. The president of the Vatican’s criminal tribunal, Giuseppe Pignatone, set July 27 as the trial date, but lawyers for the defendants immediately questioned how they could prepare for trial so soon given they hadn’t yet formally received the indictment or any of the documentation in the case. The 487-page indictment was handed down following a sprawling, two-year investigation into how the Secretariat of State managed its vast asset portfolio, much of which is funded by the Peter’s Pence donations from the faithful. The scandal over multimillion-dollar losses has resulted in a sharp reduction in donations and prompted Pope Francis to strip the office of its ability to manage the money. Five former …