From the rear cover:
A supplement for Marc Miller's Traveller
What is the meaning of life?
From their first primitive ancestors to the time of the great, star-spanning Third Imperium, almost every known sophont race has developed religion.
The diversity of alien species…
…has led to an equally diverse range of religions and beliefs which can affect every aspect of a world's culture. An unwary traveller who falls foul of these beliefs may find themselves disliked, ignored, cast out or even sentenced to death!
Flesh-out your Traveller worlds…
…using the 101 religions, beliefs and cults detailed in this supplement. Every religion has player information, referee data and one or more plot ideas for creating quick-to-run adventures. The religions are grouped by IISS religion code.