Jupiter - Ben Bova

Idealistic young American scientist Grant Archer joins a clandestine expedition to this awesome new world.
But Grant does not share the ideals of the scientists he accompanies: he has been planted on their expedition by the New Morality, a religious group that wants to ferret what the 'godless humanists' have discovered. His mission: to reassure the new religious leaders of Earth that Jupiter holds no intelligent life.

But unknown to the New Morality, Grant, though the son of a minister, is both a believer and a man who sees no reason why science and faith can not co-exist. He has come to the vast, planet-girdling ocean of Jupiter with an open mind, and he is about to tell his masters something that may shatter their conviction.