Start with high-confidence christianity books, then narrow by subgenre or adjacent topics.
My Jesus Year
Benyamin Cohen
Joan of Arc
Helen Castor
Organic Church
Neil Cole, Leonard Sweet
Echo of the Soul
J. Philip Newell, John Philip Newell
Never Retire
Dan Benson
Paul and Jesus
James D. Tabor
Enchiridion
Augustine of Hippo
Attaining Your Desires
Geneviève Behrend
Orthodoxy
G.K. Chesterton, Trevor O'Hare
Jesus the Christ
James E. Talmage
Spiritual Counsels of Father De Caussade
Jean-Pierre de Caussade
