Tents shine in the sun, banners flap and protesters, like an army regathering in an unfinished war, march down boulevards into Tahrir Square, where President Mohamed Morsi is cursed and scorned through loudspeakers crackling in the sweltering heat.

The latest protests against the Islamist president began Friday and are expected to culminate Sunday, the one-year anniversary of Morsi’s inauguration. The days ahead are crucial to Egypt’s future as a democracy and are likely to determine whether the nation will veer into factional bloodshed between Islamists and secularists.