Revolt in 2100 is a 1953 collection by Robert A. Heinlein and is part of his Future History series.
The contents are as follows:
The short novel, "If This Goes On—", describes a rebellion against an American theocracy and thus served as the vehicle for Heinlein to criticise the authoritarian potential of Protestant Christian fundamentalism. The work is not an attack on religion in general, however, as he has a Mormon community take part in the anti-theocratic revolt. Heinlein rewrote the work for this appearance.
The short stories, "Coventry" and "Misfit", describe the succeeding secular liberal society from the point of view of characters who reject it.