Saddleback Church, Lake Forest, Calif., celebrated the 20,000th baptism in its 25-year history in a quiet ceremony March 19. In an outdoor baptismal pool built of native stone, Pastor Rick Warren immersed Mario Soto, a 24-year-old resident of Aliso Viejo, Calif. Soto was among about a dozen other adults being baptized. It had been quite a weekend for Soto. On…