The Vatican's tougher stand on homosexuality has divided American Catholics, with some welcoming it as a renewal of a Church plagued by scandal and others warning it would further alienate Catholic leaders. Reflecting the divisions foreseen by some churchmen and scholars, a Catholic priest in Arizona announced his resignation because of "aggressive anti-gay positions" at the Vatican and the U.S. Church. "I could no longer stay in that institution with any amount of integrity," Rev. Leonard Walker, 58, told the Arizona Republic after resigning from the Queen of Peace Church. Apparently trying to defuse controversy over the eight-page Vatican document...