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The book takes the reader back to the roots of the Christian faith in order to answer the questions posed in the title: what do Christians believe, why do they believe it, and why does it really matter.

The book presents a global picture of how, over two millennia of human history, orthodox Christian faith has been the greatest driving force in the formation of Western civilisation. The flourishing of the faith brought the countries of the Old and New Worlds a dominant role on the planet, and its neglect today leads to terrible consequences of cultural decay, clash of civilisations and other problems.

The author touches upon the main dogmas (statements) shared by Christians of all denominations and tries to prove with many testimonies and life examples - from ancient history to the present day - why believers should firmly hold on to orthodox Christianity - the faith once and for all handed down to the saints.