The Church of Scientology International has produces a beautiful textbook on the Scientology religion.  It is called Scientology: Theology and Practice of a Contemporary Religion.

Here is a quote from the chapter on Scientology religious doctine:

"Scientology religious doctrine includes certain fundamental truths. Prime among them are that man is a spiritual being whose existence spans more than one life and who is endowed with abilities well beyond those which he normally considers he possesses. He is not only able to solve his own problems, accomplish his goals and gain lasting happiness, but also to achieve new states of spiritual awareness he may never have dreamed possible.

"Scientology holds that man is basically good, and that his spiritual salvation depends upon himself, his relationships with his fellows and his attainment of brotherhood with the universe. In that regard, Scientology is a religious philosophy in the most profound sense of the word, for it is concerned with no less than the full rehabilitation of man’s innate spiritual self—his capabilities, his awareness, and his certainty of his own immortality."