BAGHDAD — Predawn explosions yesterday ripped through five empty Christian churches in the Iraqi capital, ... Thousands of Christians have fled Iraq since the fall of the regime of Saddam Hussein. The church bombings, while claiming no casualties, appeared calculated to intimidate the remaining believers, estimated to number about 800,000. ... "It was horrible," said Odet Abdul, 48, who attends one of the bombed churches and lives around the block, adding that she thought she was about to die when she heard the blast. "They want us to leave Iraq; that is the message." ... Christians in the capital swept...