Cuba’s evangelical alliance leads crusade against gay marriage.

Mariela Castro (in car, on left), who champions gay rights, at Havana’s Gay Pride last year. (Photograph: Yamil Lage/Getty)

A thousand parishioners gathered in the Methodist church in the Vedado district of Cuba’s capital on a recent Sunday morning. After the revival music and conga drums had faded, the dancers had come off stage and the faithful had lowered…