Jeff Chu was married last September, on the lawn of a house on Cape Cod, against the backdrop of an ivy-covered fence. About 80 people came. His mother and father weren’t among them. His mother sent an e-mail just beforehand, to let him know that she was thinking of him. But to be a part of the ceremony? To celebrate the day? That much she couldn’t do, because Jeff was pledging his devotion to another man. And his parents, strict Southern Baptists, have always deemed such a love sinful, and against God’s wishes.