Paperback.  From 1980.  Back and front cover intact.  A bit beat up but completely readable.

A determined group of colonists are attempting to establish a bridgehead on the planet Pandora, despite the savagery of the native lifeforms, as deadly as they are inhospitable. But they have more to deal with than just murderous aliens: their ship’s computer has been given artificial consciousness and has decided that it is a God. Now it is insisting - with all the not inconsiderable force of its impressive array of armaments to back it up - that the colonists find appropriate ways to worship It .