CAIRO — The headline screamed from a venerable liberal newspaper: Coptic Christians had abducted a young Muslim and tattooed her with a cross. “Copts kidnap Raghada!”

“They tied me up with ropes, beat me with shoes, shaved my hair,” Raghada Salem Abdel Fattah, 19, declared, “and forced me to read Christian psalms!”

Like many similar stories proliferating here since the revolution, Ms. Abdel Fattah’s kidnapping could not be confirmed. But for members of Egypt’s Coptic Christian minority, the sensational headline — from a respected publisher, no less — served to validate their fear that the Egyptian revolution had made their country less tolerant and more dangerous for religious minorities. The Arab Spring initially appeared to open a welcoming door to the dwindling number of Christian Arabs who, after years of feeling marginalized, eagerly joined the call for democracy and rule of law. But now many Christians here say they fear that the fall of the police state has allowed long-simmering tensions to explode, potentially threatening the character of Egypt, and the region.

“Will Christians have equal rights and full citizenship or not?” asked Sarkis Naoum, a Christian commentator in Beirut, Lebanon. A surge of sectarian violence in Cairo — 24 dead, more than 200 wounded and three churches in flames since President Hosni Mubarak’s downfall — has turned Christian-Muslim tensions into one of the gravest threats to the revolution’s stability. But it is also a pivotal test of Egypt’s tolerance, pluralism and the rule of law. The revolution has empowered the majority but also opened new questions about the protection of minority rights like freedom of religion or expression as Islamist groups step forward to lay out their agendas and test their political might.