It may be that the Mangrik people have formed an incorrect view of what Christians believe, based upon observation of nominal Christians in their region.
Even though the Mangrik people may have a fairly high literacy rate, using oral means of communicating the Gospel of Jesus may be the best approach. Films, recordings, and stories from Scripture will likely have a favorable result.
Pray for the followers of Christ
There is no indication that any of the Mangrik community know Christ as Savior. But pray for those that will soon come to know and follow him. Pray they will have nothing to do with the deeds of darkness, living as children of light. Pray they will be zealous to know and follow Christ.
Pray for the entire people group
Pray for the Mangrik community to continue to be able to care for their families adequately. Pray for competent village-level leadership.
"The harvest is plentiful, but the workers are few. Therefore beseech the Lord of the harvest to send out workers into His harvest." Matthew 9:37-38
Text source: Joshua Project