“Let’s not forget how he died. He died helping someone,” said Harry Korkoryah, Mr. Duncan’s half brother. “He answered that call from God.”

Image Thomas Eric Duncan Credit... Wilmot Chayee/Associated Press

Undercurrents of frustration and doubt ran throughout the morning service.

“Where did Ebola come from to destroy people?” sermonized Bishop Arthur F. Kulah of the United Methodist Church in Liberia, one of at least nine members of the clergy from various churches at the service. “To set behind people who were already behind?”

Several relatives implied strongly that they did not believe the hospital’s or officials’ narratives of what had happened to Mr. Duncan during his illness in Dallas, where he arrived in September.

“The day will come when we all have answers for what happened to my brother,” said Josephus Weeks, Mr. Duncan’s nephew, who was the same age as his uncle and raised alongside him.

Mr. Weeks has been sharply critical of the care his uncle received at Texas Health Presbyterian Hospital, denouncing the hospital for “ignorance, incompetence and indecency” in an opinion article on Tuesday in The Dallas Morning News and saying the hospital had been indifferent to the suffering of a black man who lacked health insurance. He was more muted after the solemn service here but did not hide his dissatisfaction, saying in an interview that the hospital had still not responded to the family’s questions.