Gabriel Chamoun, chairman of the Saint Mary congregation in Ektorp, said that the Monday night flare-up had bewildered him.
"We're raised to turn the other cheek, to follow the bible and to forgive," he told local newspaper Norrköpings Tidningar on Thursday.
The Syrian-Orthodox bishop from Stockholm was set to visit the congregation on Thursday evening.
"I'm sure he'll try to calm them and ask them to not think of revenge if they're having those kinds of thoughts," Chamoun said.
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The large-scale Monday night brawl involved up to forty people wielding knuckledusters, knives and guns, police said. The conflict left two brothers dead. The police described the incident as a "family dispute".