Brazilians vote on Sunday in a polarising presidential runoff election that pits an incumbent vowing to safeguard conservative Christian values against a former president promising to return the country to a more prosperous past. The runoff shaped up as a close contest between President Jair Bolsonaro and his political nemesis, former President Luiz Inácio Lula da Silva. Both are well-known, divisive political figures who stir passion as much as loathing. The vote will determine if the world’s fourth-largest democracy stays the same course of far-right politics or returns a leftist to the top …