Rev Hassan Taour and Rev Kuwa Shamal are facing the death penalty, accused of crimes against the state, and on Monday they were also accused of providing support for rebels in Sudan's Nuba Mountain region.
The pair, who have been detained since May, were accused of fabricating lies about Christian persecution in Sudan in August as part of their trial.
Both men have also denied claims by the government that they are spying for rebels.
Sudan:
Leader: President Omar al-Bashir
Population: 41.2 million, 2 million Christians
Main Religion: Islam
Government: Republic
World Watch List Rank: 8
Source of Persecution: Islamic extremism/Dictatorial paranoia
The 'evidence' presented at the trial involved videos of the men to back up their charges.
World Watch Monitor has been told by sources in the country that the defence lawyers challenged how relevant the video material was to the case.
The judge agreed and told prosecution to come better prepared at the next date.
The men are accused of seven crimes, including waging war against the state, which carries the death penalty and conspiracy and espionage.
Sudan ranks at number eight in the world for persecution against Christians according to Open Doors World Watch List.
Rev Hassan Taour has fallen unwell and is hoping to see doctors for ulcers if allowed by authorities on 29th September.
Their hearing has been adjourned until 17th October, according to World Watch Monitor.
