Josh Wentz, pastor at Batikent Protestant Church in Ankara, was speaking after the attack in Gaziantep, near Syria's border.
He said there is hope in this dark time.
"What gives us hope is knowing that in Bible, we see that God is no respecter of persons and that he doesn't prefer any one group of people over another - he has love for all people," he said.
"It's our prayer that everyone in Turkey will come to know that love."
Officials said Saturday's attack in Gaziantep, near Syria's border, appeared to be a suicide bombing.
President Recep Tayyip Erdogan issued a statement on Sunday saying that Islamic State was "the most likely perpetrator of the Gaziantep attack".
The initial death toll was 30 killed and 94 wounded.
Later, the Gaziantep governor's office raised the toll to 50, without giving a number of wounded, according to the state-run Anadolu Agency.
In Gaziantep, deputy prime minister Mehmet Simsek and the country's health minister visited the wounded and inspected the site of the attack.
"This is a massacre of unprecedented cruelty and barbarism," he told reporters. "We are united against all terror organisations. They will not yield."
Turkey has been rocked by a wave of attacks in the past year that have either been claimed by Kurdish militants linked to the outlawed Kurdistan Workers' Party - known by its acronym PKK - or were blamed on IS.
Earlier this week a string of bombings blamed on the PKK that targeted police and soldiers killed at least a dozen people.
Josh Wentz says prayers can help.
He said: "Our desire in every situation is for the earth to be as in heaven, as for the things we see on earth and things we experience on earth to be as they are in heaven and we know that this isn't happening right now unfortunately in our country, as well as in other countries around the world."
Listen to Premier's Hannah Tooley speak to Joe Wentz here:
