Rights advocates see cases like Abdel-Nour's as politically motivated persecution. They say the verdicts tend to be harsher in southern Egypt, where Islamists are particularly powerful and Muslims are more conservative.
"Any move or word by a Christian is enough to get the rumor mill working," said Amr Ezzat, a prominent researcher in Islamic groups at the Cairo-based Egyptian Initiative for Personal Rights (EIPR). "Rumors quickly spread in villages or the towns where the radar of Islamist activists detect them and turn them into a rallying cry under the pretext that Islam's supremacy is endangered."
Salafis advocate an uncompromising and literal interpretation of the Quran, believing society must mirror the way the prophet and his immediate successors ruled in the 7th century. Some Salafi-based political groups are at odds with Egypt's Muslim Brotherhood, an Islamist group from which Morsi hails, while others are avid supporters of his government.
Part of the Salafis' antagonism toward Christians is rooted in the belief that they were a protected group under Mubarak's regime while they, the Salafis, were persecuted. Now empowered, they may be out to exact revenge on the Christians, who make up about 10 percent of Egypt's 90 million people.
The Egyptian Federation for Human Rights, led by former judge Naguib Gibrael, detects a trend in the number of lawsuits and court rulings leveled against Christians and school teachers in particular over the past year.
Gibrael, a lawyer who is representing Abdul-Nour, says it's his 18th case defending Christians — several of them teachers — detained over insulting Islam. He says his 17 other clients received three to six years in prison. They go to appeals courts, hoping for retrials or lighter sentences.
Another rights group, the EIPR, said it chronicled at least 36 blasphemy cases in 2011 and 2012, including more than 10 convictions, and that Christian school teachers were frequent targets.
"Teachers are an easy target," said Gibrael. "Any two students can say anything about their teachers. Islamist teachers collect signatures, and quickly Islamists move a case, then terrorize the court by holding protests and besieging the court building until the judge issues a verdict. I have seen it all," he said.
In Cairo, public figures who have lately faced blasphemy accusations or trials like movie star Adel Imam were all cleared, thanks to media attention, lobbying by rights groups and heavy police presence.
In rural areas, according to EIPR researcher Ishak Ibrahim, even those acquitted or otherwise cleared of blasphemy accusations face social or administrative punishment, with some forced by villagers to leave their homes, pay a fine or get demoted or suspended by their state employers.
Egypt's Muslim Brotherhood likes to project itself as a more moderate Islamist group when compared to the ultraconservative Salafis, but they still play a role in the blasphemy cases.
The top Brotherhood leader in Luxor, Abdel-Hamid el-Senoussi, is a lawmaker and the head of the legal team representing the families whose children testified against Abdel-Nour.
He acknowledged that two investigations by the school found no justification for the children's claims, but said he does not trust those findings.
"They just want to avoid discord. But we prefer to get to the bottom of it," he said. "Even if the court clears the teacher and rules that she is innocent, she must be fired from the school."
"There are people who want to mess up with the ship of the nation and this teacher is one of them," he said.
For him, the penalty for contempt of religion is not harsh enough. "I prefer 10 years imprisonment and, in case the judge clears the defendant, a fine that goes toward the upkeep of places of worship."
"Anyone who insults religions must be punished to deter further assaults," he said.
AP writer Haggag Salama contributed to this story from Luxor, Egypt
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