CAMBRIDGE, MA (AP).- Since the 18th century, Christ Church Cambridge has survived more than just the rattling, pounding and drenching of New England weather. It took a bullet, then worse, during the Revolutionary War because of the Tory loyalties of its founders. For several years after the war, the ransacked building’s windows were open to the elements. But the building endured and the church with it, eventually hosting a Sunday school teacher named Teddy Roosevelt, a press conference with the Rev. Martin Luther King Jr. and, soon, a celebration of its 250th year. In preparation, this Episcopalian church in Harvard Square has undergone a painstaking exterior renovation aimed at preserving a building that offers a rare link to early America. “It’s about as important as they get,” said Charles Sullivan, executive director of the Cambridge Historical Commission, referring to the buildings in his city. “It’s